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Calculating a salesperson's income based on years of service and commission from sales

Writing one number as a percentage of another.

Calculating the original amount when told that $p\%$ is $x$. The value given can be non-integer.

Calculate one number as percentage of another.

Calculate probability using P(A) = 1-P(not A)

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Calculate P(A|B) given a two way table.

Calculate P(A|B) given a Venn diagram.

Calculate P(A|B) given P(A), P(B) and intersection.