Anumber subtracted from 90 is 3 times that number

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.