Question

The graph shows the relationship between the total cost and the number of gift cards that Raj bought for raffle prizes.

A graph titled Cost of Gift Cards. The x-axis shows the number of gift cards, numbered 1 to 9, and the y-axis shows the total cost in dollars, numbered 10 to 90. Blue diamonds appear at points (1, 20), (2, 40), (3, 60), (4, 80).
What would be the cost for 5 of the gift cards?

$80
$90
$100
$110

Answer 1

$100

Each additional card increases cost by $20 (20, 40, 60, 80…), so 5 cards cost 5 × $20 = $100.