Question

a grocery store sells American cheese for $3.89 per pound about how much would a dollar in 1.89 pounds of cheese cost

Answer 1

to find the answer you need to figure out what to pultiply times one pound to get 1.89 pounds. which would be 1.89. 
Since 1 pound is 3.89
1.89 pounds times 3.89=7.35
so your answer would be 7.35