Answer:
b) $4.60
Explanation:
a)
2 panels at $923.40 each = $1846.80
Total with installation: $1944.80
Installation $1944.80-$1846.80 = $98
b)
2 panels at $940.50 each = $1881.00
Total with installation: $1983.60
Installation $1983.60-$1881.00 = $102.60
Substract a from b
102.60-98 = 4.60