In November, a toy was $40. In December, the price increased by 80%. In January, the price decreased by 50%. What was the price of the toy after it was discounted in January?
Solve this problem. 
In November, the toy's price was $40.
The 80% increment represents 40*0.8=$32
In December, the toy's price was 40 + 32 = $72.
The 50% increment from January represents 72*0.5=36
In January, the toy's price is 72 - 36 = $36.