Can someone explain how to do this ?

Bananas are $1.29 per pound. We need to know how much bananas cost 1.2 pounds.

We can split 1.2 into different parts. One easy way is to split 1.2 into six 0.2s.
1 pound can be split into five 0.2s.
To figure out the price of 0.2 pounds of bananas, we divide $1.29 by 5.
1.29 divided by 5 is equal to 0.258.

$1.548 rounded to the nearest cent is $1.55.

The answer to this question is -1.