The price of a television was reduced from $250 to $200. by what percentage was the price of the television reduced ?

20%
250/200 = 0.8 = 80%, 100% - 80% = 20%

To find percent change we need too compare the difference between the prices to the original amount as a ratio.
The difference in price is $50
The original price is $250

50/250= .2

.2 times 100 gives you a reduction in price of 20%