Physics
posted by Bob .
An engine has a hot reservoir of 520K and a low temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of %
I got 36.5% but the teacher is saying that's wrong!! Please help with calculation.

eff= 1330/520=36.5 percent, not counting significant digits. I only see two sig digits in the temps. 37 percent using two sig digits.