Sam earned a $2,000 commission on a big sale, raising his average commission by $100. If Sam's new average commission is $900, how many sales has he made?
The answer choices would have helped to plug in.
Nevertheless, (sum of all sales/number of sales) = average per sale
x = original value of sales
n= original number of sales
(x+2000)/(n+1) = 900 ---> Eqn I
(x/n) = 900 - 100 = 800 ---> Eqn II
n = 11, n+1 =12.
Total number of Sales = 12.
Is this the correct answer?
