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OG19新題
Greg assembles units of a certain product at a factory . Each day he is paid $2.00 per unit for the first 40 units that he assembles and $2.50 for each additional unit that he assembles that day . If Greg assembled at least 30 units on each of two days and was paid a total of $180.00 for assembling units on the two days, what is the greatest possible number of units that he could have assembled on one of the two days ?
A.48
B.52
C.56
D.60
E.64
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答案：
C
設(shè)兩天的
當(dāng)y=30時(shí)，x最大
2*40+(x-40)*2.5+2*30=180
(x-40)*2.5=40
x=56
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