% means per 100
so when figuring out percents it's good to use 100
so
on $100 7% would mean $7
on $50 7% would mean $3.5
in $200 7% would mean $14
$2.25 an ounce for unit price
It subtracts 2 then adds 5
Her current balance aftsr adding 60$ 3 times would be -65
