Last year, an appliance store sold an average of 42 microwave ovens per month. In the first 10 months of this year, the store has sold an average of only 20 microwaves per month. What was the average number of microwaves sold per month during the ent

Last year, an appliance store sold an average of 42 microwave ovens pe

1.	Last year, an appliance store sold an average of 42 microwave ovens per month. In the first 10 months of this year, the store has sold an average of only 20 microwaves per month. What was the average number of microwaves sold per month during the ent
A.	30
B.	21
C.	32
D.	31
Answer» D. 31