You buy butter for $3 a pound. One portion of onion compote requires 1.4 oz of butter. How much does the butter for one portion cost? Round to the nearest cent.

$0.38

:

First we need to convert pounds to ounces

1 pound = 16 ounces

Thus 16 ounces cost $3

If a portion requires two ounces of butter, we must find out the cost of these 2 ounces, knowing that 16 ounces cost $ 3

ounces       cost

16          --        $3

2           --          x

To find the cost x:

rounding to the nearest cent: $0.38