Question 367623
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Hi,
Swiss chees costs $7.95 per pound
Louis buys 0.8 pound, pays .8*$7.95 = $6.36
Samantha pays 12.72, buys $12.72/$7.95 = 1.6 lbs

Calculators make quick work of the answers
However, good idea is to always have an estimate of the answer in mind.