Why Is My Calculation of Carnot Engine Efficiency Incorrect?

[obxer22]

Homework Statement

A Carnot engine operates between 230°C and 120°C, absorbing 6.30*10^4 J per cycle at the higher temperature.

What is the efficiency of the engine?

Homework Equations

eff = 1 - (T_cold/T_hot)

The Attempt at a Solution

Using this equation, I get 47.83 percent, which the system is telling me is incorrect. Can anybody offer a solution to this? Thanks.

 

[obxer22]

i was not using kelvin, so i got the answer