Answer:
1) $0.18 - rounded 
 $0.18125 - original answer 
2) $2.70
Explanation:
For first equation: 
1. Divide $1.45 by 8.
2. Get $0.18125
3. Round to $0.18
For second equation: 
1. Multiply the amount of bananas (15) by how much they are ($0.18)
 15 X $0.18 = $2.7
2. Get answer: You pay $2.70 for 15 bananas.