Answer
a. $S(x)=25000+0.01x,$
b. $S(1000000)=35000$
c. $x=7500000$
d. $x>12500000$
Work Step by Step
a. For a salary of $25000$ plus $1\%$ his total annual sales,
$S(x)=25000+0.01x,$
b. $S(1000000)=25000+0.01(1000000)=35000$
c. $25000+0.01x=100000,$
$0.01x=75000,$
$x=7500000$
d. $25000+0.01x>150000,$
$0.01x>125000,$
$x>12500000$
