A certain business produced x rakes each month from November through February and shipped 0.5x rakes at the beginning of each month from March through October. The business paid no storage costs for the rakes from November through February, but it paid storage costs of $0.10 per rake each month from March through October for the rakes that had not been shipped. In terms of x, what was the total storage cost, in dollars, that the business paid for the rakes for the 12 months from November through October?
(A) 0.40x
(B) 1.20x
(C) 1.40x
(D) 1.60x
(E) 3.20x
Ans:C
我選a，不懂為什麼是c
46
If a coin has an equal probability of landing heads up or tails up each time it is flipped, what is the probability that the coin will land heads up exactly twice in 3 consecutive flips?
(A) 0.125
(B) 0.25
(C) 0.375
(D) 0.50
(E) 0.666
Ans:C
一直對於這類型的題目還蠻頭大的,呵呵~
感謝協助解題啦~~~
