Question

toni bought an old bike for 50$. She fixed it up and sold it for $80. What percent of the original value was toni’s sale price

Answer 1

For this case what you must do is the following rule of three:
 50 ---> 100
 80 ----> x
 We clear x:
 x = (80/50) * (100)
 x = 160%
 160-100 = 60%
 Answer:
 toni added 60% of the original value for his sale price