Heather works in a clothes shop where she earns a commission of 5% and no weekly salary. what will heather's weekly sales have to be for her to earn $375.00 in a week?

answer:  

\boxed {\frac{1}{5}}  

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solution-

60 *   \frac{1}{5}   = 12

90 * \frac{1}{5} = 18

75 * \frac{1}{5} = 15

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hence, the answer would be \boxed {\frac{1}{5}}