7.) A radio sales for $230. If this price represents a profit of 15 percent of the cost for the seller, how much did he buy for it?
a. 100
b. 200
c. 300
d. 400

8.) If the temperature rises from 72° to 90°, what is the percent of the increase?
a. 10%
b. 20%
c. 15%
d. 25%

9.) The house rent of Php 20,000 increased by 15% this year. What is the present rent of the house?
a. Php 23,000
b. Php 32,000
c. Php 13,000
d. Php 31,000

10.) After a 25% increase, the population is 48,000. What was the population before the increase?
a. 38,400
b. 83,400
c. 43,800
d. 34,800