See the solutions to these problems just after the percentage calculator below.

Here are the solutions to the questions stated above:

Always use this formula to find a percentage:

^{%} / _{100} = ^{Part} / _{Whole} replace the given values:

^{100} / _{100} = ^{Part} / _{4/5}

Cross multiply:

100 x 4/5 = 100 x Part, or

80 = 100 x Part

Now, divide by 100 and get the answer:

Part = ^{80} / _{100} = 4

Use again the same percentage formula:

^{%} / _{100} = ^{Part} / _{Whole} replace the given values:

^{%} / _{100} = ^{100} / _{4/5}

Cross multiply:

% x 4/5 = 100 x 100

Divide by 4/5 and get the percentage:

% = ^{100 x 100} / _{4/5} = 12500%

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