1000x 50%
Isnt it 10,000? 1000*50%=500 then you do 500*20=10,000
Do you mean compoundly because if then you just take 1000 * 0.5^20 which would equal
0.000 953 674 316 4 when put into the calculator.
Hope I could help!
The poster could have meant either of those things or something completely different.
the question is incomplete.