We already have our first value **21** and the second value **27**. Let's assume the unknown value is **Y** which answer we will find out.

As we have all the required values we need, Now we can put them in a simple mathematical formula as below:

STEP 1 Y = 2127

By multiplying both numerator and denominator by 100 we will get:

STEP 2 Y = 2127 × 100100 = 77.778100

STEP 3 Y = 77.778

Finally, we have found the value of Y which is 77.778 and that is our answer.

If you want to use a calculator to find **21 is what percent of 27**, simply enter **21 ÷ 27 × 100** and you will get your answer which is **77.778**

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Here is a calculator to solve percentage calculations such as 21 is what percent of 27. You can solve this type of calculation with your values by entering them into the calculator's fields, and click *'Calculate'* to get the result and explanation.

**Question:** Your Uncle, who loves to collect antique coins, collected 21 coins from his list of 27 coins. What percent of coins has he collected?

**Answer:** He collected 77.778 percent of the coins from his list.

**Question:** Your aunt has baked 27 cookies, and she gave you 21 to take home with you. What percent of the cookies did she give you?

**Answer:** 77.778 percent of the cookies.

Let's solve the equation for Y by first rewriting it as: **100% / 27 = Y% / 21**

Drop the percentage marks to simplify your calculations: **100 / 27 = Y / 21**

Multiply both sides by 21 to isolate Y on the right side of the equation: **21 ( 100 / 27 ) = Y**

Computing the left side, we get: **77.778 = Y**

This leaves us with our final answer: **21 is 77.778 percent of 27**

21 is 77.778 percent of 27 |

21.01 is 77.815 percent of 27 |

21.02 is 77.852 percent of 27 |

21.03 is 77.889 percent of 27 |

21.04 is 77.926 percent of 27 |

21.05 is 77.963 percent of 27 |

21.06 is 78 percent of 27 |

21.07 is 78.037 percent of 27 |

21.08 is 78.074 percent of 27 |

21.09 is 78.111 percent of 27 |

21.1 is 78.148 percent of 27 |

21.11 is 78.185 percent of 27 |

21.12 is 78.222 percent of 27 |

21.13 is 78.259 percent of 27 |

21.14 is 78.296 percent of 27 |

21.15 is 78.333 percent of 27 |

21.16 is 78.37 percent of 27 |

21.17 is 78.407 percent of 27 |

21.18 is 78.444 percent of 27 |

21.19 is 78.481 percent of 27 |

21.2 is 78.519 percent of 27 |

21.21 is 78.556 percent of 27 |

21.22 is 78.593 percent of 27 |

21.23 is 78.63 percent of 27 |

21.24 is 78.667 percent of 27 |

21.25 is 78.704 percent of 27 |

21.26 is 78.741 percent of 27 |

21.27 is 78.778 percent of 27 |

21.28 is 78.815 percent of 27 |

21.29 is 78.852 percent of 27 |

21.3 is 78.889 percent of 27 |

21.31 is 78.926 percent of 27 |

21.32 is 78.963 percent of 27 |

21.33 is 79 percent of 27 |

21.34 is 79.037 percent of 27 |

21.35 is 79.074 percent of 27 |

21.36 is 79.111 percent of 27 |

21.37 is 79.148 percent of 27 |

21.38 is 79.185 percent of 27 |

21.39 is 79.222 percent of 27 |

21.4 is 79.259 percent of 27 |

21.41 is 79.296 percent of 27 |

21.42 is 79.333 percent of 27 |

21.43 is 79.37 percent of 27 |

21.44 is 79.407 percent of 27 |

21.45 is 79.444 percent of 27 |

21.46 is 79.481 percent of 27 |

21.47 is 79.519 percent of 27 |

21.48 is 79.556 percent of 27 |

21.49 is 79.593 percent of 27 |

21.5 is 79.63 percent of 27 |

21.51 is 79.667 percent of 27 |

21.52 is 79.704 percent of 27 |

21.53 is 79.741 percent of 27 |

21.54 is 79.778 percent of 27 |

21.55 is 79.815 percent of 27 |

21.56 is 79.852 percent of 27 |

21.57 is 79.889 percent of 27 |

21.58 is 79.926 percent of 27 |

21.59 is 79.963 percent of 27 |

21.6 is 80 percent of 27 |

21.61 is 80.037 percent of 27 |

21.62 is 80.074 percent of 27 |

21.63 is 80.111 percent of 27 |

21.64 is 80.148 percent of 27 |

21.65 is 80.185 percent of 27 |

21.66 is 80.222 percent of 27 |

21.67 is 80.259 percent of 27 |

21.68 is 80.296 percent of 27 |

21.69 is 80.333 percent of 27 |

21.7 is 80.37 percent of 27 |

21.71 is 80.407 percent of 27 |

21.72 is 80.444 percent of 27 |

21.73 is 80.481 percent of 27 |

21.74 is 80.519 percent of 27 |

21.75 is 80.556 percent of 27 |

21.76 is 80.593 percent of 27 |

21.77 is 80.63 percent of 27 |

21.78 is 80.667 percent of 27 |

21.79 is 80.704 percent of 27 |

21.8 is 80.741 percent of 27 |

21.81 is 80.778 percent of 27 |

21.82 is 80.815 percent of 27 |

21.83 is 80.852 percent of 27 |

21.84 is 80.889 percent of 27 |

21.85 is 80.926 percent of 27 |

21.86 is 80.963 percent of 27 |

21.87 is 81 percent of 27 |

21.88 is 81.037 percent of 27 |

21.89 is 81.074 percent of 27 |

21.9 is 81.111 percent of 27 |

21.91 is 81.148 percent of 27 |

21.92 is 81.185 percent of 27 |

21.93 is 81.222 percent of 27 |

21.94 is 81.259 percent of 27 |

21.95 is 81.296 percent of 27 |

21.96 is 81.333 percent of 27 |

21.97 is 81.37 percent of 27 |

21.98 is 81.407 percent of 27 |

21.99 is 81.444 percent of 27 |