1000 + 40 + 1000 + 30 + 1000 + 20 + 1000 + 10 = ?
Note: You need to answer in less than 30 seconds. In comment does write the time taken by you along with the answer.
4100.
1000 + 40 = 1040
1040 + 1000 = 2040
2040 + 30 = 2070
2070 + 1000 = 3070
3070 + 20 = 3090
3090 + 1000 = 4090
4090 + 10 = 4100
