Math question efficiency

Question

A solar collector has 1000 Btu/min of radiant energy available on a clear sunny day. The collector can transfer 450 Btu/min to a storage tank. What is the efficiency of the system?

I used n= energy-output/energy-input *100

I plugged it all in $\;\dfrac{450}{1000}*\times 100\%$.

I got $45\%$, however on my answer choices it says the answer is $48\%$?

Exact Question. Maybe I used the wrong formula?

A solar collector has 1000 Btu/min of radiant energy available on a clear sunny day. The collector can transfer 450 Btu/min to a storage tank. What is the efficiency of the system?

A. 17%
B. 25%
C. 37%
D. 48%

There is a typo somewhere. Your calculation is correct. – André Nicolas May 18 '13 at 20:12 — André Nicolas, May 18 '13 at 20:12

score 3 · Accepted Answer · answered May 18 '13 at 20:23

3

You used the correct formula, and your calculation is the correct answer: $45\%$.

There must be a misprint/typo in the solution manual/text.

answered May 18 '13 at 20:23

amWhy

209,954

I'll ask the teacher on Wednesday. – Jon May 18 '13 at 20:25
You did everything correctly, so no worries with your answer. Yes, tell the teacher. S/he will want to know! – amWhy May 18 '13 at 20:28
Nice for OP to get ack! +1 – Amzoti May 19 '13 at 00:46

Math question efficiency

1 Answers1