Final answer:
Peter will need to save an additional $4.95 to buy the DVD after saving for 4 weeks.
Step-by-step explanation:
To find out how much more money Peter will need to save after 4 weeks, we need to calculate how much money he has saved in those 4 weeks, and then subtract that amount from the cost of the DVD. Given that Peter is saving $4.95 each week, after 4 weeks he will have saved a total of 4 x $4.95 = $19.80. To find out how much more money he will need to save, we subtract $19.80 from the cost of the DVD, which is $24.75: $24.75 - $19.80 = $4.95. So, Peter will need to save an additional $4.95 to buy the DVD after saving for 4 weeks.