SOLUTION: Written below is a question from my summer homework. I know that the equation will involve adding 68 to something times 0.08, so C. seems to be the correct choice, but I can't say

Question 467341: Written below is a question from my summer homework. I know that the equation will involve adding 68 to something times 0.08, so C. seems to be the correct choice, but I can't say for sure. Besides, even if C. is correct, why must 0.08 be multiplied by the quantity of 252-142? I'd appreciate your help!
Each week Ian earns a 8% bonus on any sales Ian makes over $142. Ian also receives a fixed salary of $68 per week. If Ian sold $252 worth of merchandise in a week, which equation could be used to determine Ian's total earnings, x, for the week?
A. 8 + 0.68(142-252) = x
B. 8 + 0.68(252-142) = x
C. 68 + 0.08(252-142) = x
D. 68 + 8 + (142-252) = x
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
C is the correct answer. $68 is his base salary. Since he earns a commission of 8% for all his sales above $142, this amounts to .08 times the amount he earns over $142--so if his sales were $252, his total compensation for that week amounts to C=68+.08(252-142)..
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