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Alligation is the way to go!



16.8 is 1/5 of the way from 15 to 24, so the 85 extra phones last month represent 1/5 of the last month’s total sales, which is thus 5(85)=425
15.3 is 1/30 of the way from 15 to 24, so the extra 16 phones two months ago represent 1/30 of the month’s total sales, which is thus 480

480-425=55

kevincan
Rashid receives a commission of $15 for every phone he sells in a given month, plus $9 for every phone he sells above the sales target set for the month. Last month, he sold 85 phones above his sales target, and his average commission per phone sold was $16.80. Two months ago, he sold 16 phones above his sales target, and his average commission per phone sold was $15.30. How many fewer phones did Rashid sell last month than two months ago?

A. 55
B. 69
C. 75
D. 106
E. 124
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