What is the perimeter of the rectangle?

a.
20 units

b.
21 units

c.
23 units

d.
24 units

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.

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.