A. )The value of C is finding the rate..
B) The missing rate is .. R= P / B , percentage divided by base .. 20 ÷ 150 = 0.13333333 so, multiply the decimal number to 100 and annex the percent sign therefore , the rate is 13.13 percent " since it's a repeated decimal so you can write (13.13 percent)
C.) The complete equation is 13.13 percent of 150 is 20..