The EastBank Choir out sold the WestBank Choir by 40% of the 100 boxes of donuts they ordered. The EastBank Choir hustled and made all of the last sales closing the sale with an average of only 25%. How many more sales did the choir make to reach this average? Choose the correct answer:
A) 20	B) 5	C) 10	D) 15	E) 25
Explanation: Identify the parts, set up equation, and solve.   Number of boxes of donuts initially sold by EastBank Choir:   40% * 100 = 40   Total boxes sold by the end of the sale leaving an average at 25%. (Let x represent the unknown number of additional boxes sold by the EastBank Choir.) Therefore, the total number of boxes sold is 100+x, and the total number of boxes sold by the EastBank Choir is 40+x. This gives the equation as:   25%*(100+x)=40+x   Solve: Let's get rid of the percent sign   25/100*(100+x)=40+x   1/4 *(100+x)=40+x   Get rid of the fraction:   4[1/4 * (100+x)]=4(40+x)   1 * (100+x) =160+4x   100+x =160+4x   (100-160)+x = (160-160)+4x   -60+x= 4x   -60=3x   20=x   20nswer: 20
<result>A</result>
The EastBank Choir out sold the WestBank Choir by 40% of the 100 boxes of donuts they ordered. The EastBank Choir hustled and made all of the last sales closing the sale with an average of only 25%. How many more sales did the choir make to reach this average?