Method 1: $2 for each bag of leaves filled
Let the bag of leaves filled = x
For, one bag of leaves raked, the cost will be $2
Let c = total cost
C = 2x
when x = 2
C = 2 * 2
C = $4
when x = 3
C = 2 * 3
C = $6
when x = 4
C = 2 * 4
C = $8
Therefore, the cost to raked bag of leaves will keep increasing as the number of bag of leaves increases
Therefore,
when x = 5
C = $10
when x = 6
C = $12
When x = 7
C = $14
Method 2:
One bag is raked for $0.02
Two bags is reaked for $0.04
Three bags is raked for $0.08
This implies that, that the amount for each bag is doubled as the number of bags increases.