Step-by-step explanation:

Answer:
$0.90
Step-by-step explanation:
$3.12+$0.98=$4.10
5-4.1=0.9
Answer:2/5 a)
Hope this helps you...
Step-by-step explanation:
Set up a proportion
90/x = 60/100
60x = 9000
x = 150
if you're wondering why I used 60 instead of 40 in the proportion it is because $90 is 60% of the original price, not 40%
hope this helps!