The smiths spent $2,000 on clothes in a particular year. if they increase the amount they spend on clothes by 10% each year, the smiths will spend a total of $ on clothing in 4 years.

2000 * .1 = 200 + 2000 = 2200 (First year)

2200 *.1 = 220 + 2200 = 2420 (second year )

2420* .1 = 242 + 2420 = 2662 (third year )

2662 * .1 = 266.2 + 2662 = 2928.2 (fourth year)

They spent $2928.2 on clothing for 4 years.

I=PRT
I= 2000* .10* 4
1= 800
your answer is 800.