Answer
a. Impossible.
b. 686.
c. 28%.
Work Step by Step
a. Reducing fat by 100% means that all the fat is gone, so anything more than 100% is impossible.
b. 58%=0.58, $0.58\cdot 1182=685.66\approx686$
c. $\frac{331}{1182}\cdot 100\approx28$%