Answer:
$140
Explanation:
1. Set up the equation
=
Percentage is out of 100 this equation says 42 of x number is equal to 30%.
2. Cross multiply
30x = 4200
3. Solve for x by dividing both sides by 30
x = 140
if 30% of full price = $42 then 100% = 42/0.3 = 140
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