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:

^{90} / _{100} = ^{Part} / _{4/10}

Cross multiply:

90 x 4/10 = 100 x Part, or

36 = 100 x Part

Now, divide by 100 and get the answer:

Part = ^{36} / _{100} = 3.6

Use again the same percentage formula:

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

^{%} / _{100} = ^{90} / _{4/10}

Cross multiply:

% x 4/10 = 90 x 100

Divide by 4/10 and get the percentage:

% = ^{90 x 100} / _{4/10} = 22500%