20% * 300 = 2 * (10% * 300) = 2*30 = 60
Answer:
$140 is the new price
Step-by-step explanation:
Formula : Amount of change / Original amount
1. 144 - 90/ 144
2. Subtract 144 and 90
3. 54/ 144
4. Divide 54 by 144
5 0.375
6 Move the decimal two places to the right.
7. 37.5 %
Answer: 37.5% is the markup rate