The chef has 80 pounds of strip loin. th
e trim loss on the strip loin is 55%
and the cooking loss is 60% of the
trimmed weight. how many pounds of
trimmed, cooked strip loin will the
chef have left to serve to his
customers?

Firstly chef will lose 55% from 80 pounds, then he will lose 60% of what he had left, so we need to do two calculations:

55% from 80 pounds =
= 55% * 80 =
= 55/100 * 80 =
= 11/20 * 80 =
= 880/20 =
= 44

So after the trimming chef will have 44 pounds of strip loin. After cooking he will lose 60% of the trimmed weight, so:

60% from 44 pounds =
= 60% * 44 =
= 60/100 * 44 =
= 6/10 * 44 =
= 3/5 * 44 =
= 132/5 =
= 26 2/5 =
= 26 4/10 =
= 26.4

After trimming and cooking, chef will have 26.4 pounds of strip loin.