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:

^{7} / _{100} = ^{Part} / _{90000000}

Cross multiply:

7 x 90000000 = 100 x Part, or

630000000 = 100 x Part

Now, divide by 100 and get the answer:

Part = ^{630000000} / _{100} = 6300000

Use again the same percentage formula:

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

^{%} / _{100} = ^{7} / _{90000000}

Cross multiply:

% x 90000000 = 7 x 100

Divide by 90000000 and get the percentage:

% = ^{7 x 100} / _{90000000} = 7.7777777777778E-6%