I need help on #12 please

Question

apologiabiology · Answer

so 10.38 gal at 2.289 oer gal but you want american mony so round 2.289 to two decimal places so 2.29 per gallon 
 2.29 times 10.38=23.7702 but you just cross out the '2' in the ten-thousanth's place because 1/50 of a cent is really small 
 it is not possible to pay 9/10 of a cent so they just want you to round it up to 1 cent or10/10 cent

apologiabiology · Answer

To determine the total cost of gasoline for 10.38 gallons at $2.289 per gallon, round the price to $2.29. Then, calculate the total cost as approximately $23.77, after rounding appropriately for currency use. 
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I need help on #12 please

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