exam Maths Puzzle Numerical Ability

A salesman gets a comission of $2.65 on each item sold. One morning he sold 15 calculators and 19 pocket radios. Find his Commission

Hi i forgot how to solve problems like this can you show steps and answer please

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exam Other Question
What is known about the # of solution to a system of m linear equations in n unkowns if "m=n", "m<n" and "m>n"? How do you turn a square root into a fraction? For example, squrt.60 is what in fraction form and how do you do that? Thanks.