Interview Maths Puzzle Numerical Ability Percentage

Hello I attend the interview on Caterpillar & i gotta question like this , I need to find the minimum percentage number, For ex
18% of 100 = 18
18% of 50 = 9
18% of 25 = 4.5
See here 9 is the least natural number , because 4.5 is the decimal , so i won't need that. I need a formula to calculate this , Can anyone help me to solve this ?

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Interview Other Question
a man can complete 10 mangoes in 5 days?in how many days he can complete 20 mangoes? There is an odometer in a bike and it is broken in a way whenever there supposed to be value 4 in one of the 5 digits in odometer it skips that and shows 5. It is not able to display the digit 4. For example, if the odometer is at reading 32363 KM then next reading it will show is 32365 and not 32364 or if the odometer shows 39999 then next reading it will show is 5000 instead 4000. So if odometer shows the current reading 56287 then what is its actual reading?