Answer is $100 original cost
Step by step
You know the total price is $200
You know the increase is 200% of x unknown
Your equation is 200% x = $200
Change your percent to a decimal by moving your decimal point two places to the left
200% = 2.00
2.00x = $200
Divide both sides by 2.00 to solve for x
2.00/ 2.00 x =$200 / 2.00
x = $100
Problem solved