5. Mark earns a weekly salary plus a commission on sales. One week his income on sales of $4000 was $660. The next week his income on sales of $6000 was $740. Find his weekly salary and his commission rate.
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let mark's weekly salary be X. The commission he gets is just going to be a percentage of his income on sales so let's make that percentage Y. Then you end up with a system of 2 equations