The electric bill in May was $248.00. In June the bill was $265.00. What is the percent of increase rounded to the nearest hundredth?

Percent increase : (new number - original number) / original number ... then multiply that by 100 to get the percent

(265 - 248) / (248) = 17/248 ... 17/248 x 100 = 1700/248 = 6.85%

1) May: 248$ and june 265$. The difference is 17$ and then you divide the difference with the old price: 17 / 248 = 6,85%

2) Same method, the difference is 59$ so 27,44%'

3) The difference is 9,5$ so you answer is 63,3%

4) The difference is 10$ divided by the original price: 10/24 = 41,66%