Sara receives a 10% commission on the first $4000 in sales and 15% on all sales beyond $4000. If Sara receives a commission of $2530, how much did she sell?

Step-by-step explanation:

$4000(0.10) = $400

which is less than her paid commission

so we know that she sold more than $4000 worth

if s is sales above $4000

$2530 = 400 + 0.15s

$2130 = 0.15s

s = $14200

so total sales x is

x = $4000 + $14200 = $18200

whatever you can spend with $11.53 or under.

step-by-step explanation:

20 - 8.47 = 11.53. take away the money he used for lunch from the starting amount of 20.

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50