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Mr. Heftwhistle gave 30% of his socks to a sockless friend. Mr. Heftwhistle then decided to move to Florida where he would rarely need socks, so he gave 60% of the socks that remained to another friend who had a sock-loving pet. What percent of socks did Mr. Heftwhistle have left?
Assume he started with x socks.
After 1st giving he had 0.70x
After 2nd giving he had 0.40(0.70)x = 0.28x
a) 10% b) 18% c) 28% d) 36% e) 40%