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superkoopasirf
To estimate the total cost, I would say that it is roughly $2 per gallon, and she is buying roughly 9 gallons, so the total cost ≈ 2 x 9 = $18.
9.16 * 1.99

= 9.16 * 1
+ 9.16 * 0.99 = around 9.07

9.16 + 9.07 = 18.23

$18.23