Answer:
10%
Step-by-step explanation:
let "x" be the percent
then "x" percent of/×/ 15 = 13.50
x%=x/100 :
x/100 × 15 =13.50
x × 15 =13.50×100
x = 1350 ÷ 15
x = 90%
since the pay rate decreased from 15 to 13.50, it means it decreased from 100% to 90%
100% - 90% = 10%
the percent decrease in Martin's pay rate is 10%