If 40% of a number is 36, then the number is
Choose the correct choice from the following
A) number is 60	B) number is 70	C) number is 90	D) number is 80	E) None of these
Solution:   Let "a" be the number we seek. We get   40% × a = 36   2 × 40% × a = 2 × 36 = 72   80% × a = 72   10% × a = 72 : 8 = 9   100% × a = 9 × 10 = 90   a = 90   Answer number is 90
<result>C</result>
If 40% of a number is 36, then the number is