The master family financed a computer that cost $1200. If the interest rate is 19%. how much will the family owe for the computer after one month if no payments are made?

The answer is $1219

Interest = Total amount * interest rate * time (I=prt is the formula for calculating interest)

In this case,

Total amount = $1200

Interest rate = $ 0.19

Time span for which interest rate is being calculated = 1/12 (since the rate is yearly and we are calculating interest for a month)

Interest = 1200*0.19*1/12 = 19

So the total amount owned by family at the end of one month = original amount + interest = $1200 + $19 = $1219