Three shops that belonged to a chain were closed, and as a result the average (arithmetic mean) annual revenue per shop in the chain grew from $150,000 to $225,000. If the number of shops in the chain before the change was 8, approximately, what was the average annual revenue of the shops that were closed? Choose the correct choice from the following answers.
A) $25,000
B) $37,500
C) $58,333
D) $75,000
E) $91,666
if the average annual revenue of the 5 shops which are still open is 225,000, it means that they make a total of 225,000∗5=1,125,000 $   let's call the average annual revenue of the 3 shops that have been closed x.   therefore, they make a total of 3∗x $   We know that the total revenue of the 8 shops that were open has to be 150,000   Thus (3x+1,125,000)/8=150,000   therefore x=25,000 answer $25,000
<result>A</result>
Three shops that belonged to a chain were closed, and as a result the average (arithmetic mean) annual revenue per shop in the chain grew from $150,000 to $225,000. If the number of shops in the chain before the change was 8, approximately, what was the average annual revenue of the shops that were closed?