Answer:
In four years.
Step-by-step explanation:
End of first year:
1000 + 20%•1000 = 1000 + 200 = $1200
End of second year:
1200 + 20%•1200 = 1200 + 240 = $1440
End of third year:
1440 + 20%•1440 = 1440 + 288 = $1728
End of fourth year:
1728 + 20%•1728 = 1728 + 345.6 = $2073.6 >2•$1000
