It is 5000000.
.08 or 8 centavos. If the cut off digit is 5-9 round up. If the cut off digit is 0-4 round down.
10
By adding simple logic you can round off to single digit. In any value you add 0.05 and pick only one digit after the decimal and the result will be the value after rounding off in one decimal place.
The tens digit is 8 and the ones digit is 5. Rounding to the nearest ten is equal to rounding at the ones digit.When rounding, if the digit is greater than 5, round up; otherwise round off.85, so 90.
To round off 128,674 to leave one nonzero digit, you would round it to 100,000.
It is 400.
It is 300000.
It is 6000000.
It is 300.
It is 500.
It is 3000000000.
500
It is 90000.
500500
It is 5000000.
It is 3000000000.