You start with 1000 then add 40
add another 1000 then add 30
add another 1000 then add 20
add one more 1000 then add 10
what is your answer?
If you said 5000 your wrong!
The answer is 4100 how?
1000+40=1040
1040+1000+30=2070
2070+1000+20=3090
3090+1000=4090
4090+10=4100
SEE ANSWER