the amount of 30% is $1200 *30 /100 = $360,
y1 =$360 (year 1), so let's find y2
the amount of 30% is $360*30/100 =$108
let 's find y3,
the amount of 30% is $108*30/100 =$32.4
let 's find y4
the amount of 30% is $32.4*30/100 =$9.72
so the value of the computer after 4 years is $9.72
