Last months cable bill was $60, while this months is $90. this was a difference (increase) of what percent?

50 % increase

Step-by-step explanation:

To find the percent increase, we take the new price and subtract the original price.  Divide it by the original price

percent increase = (new - original)/ original * 100%

                             = (90-60)/60 * 100%

                              = 30/60 *100%

                               =.5 *100%

                               =50%