The approximate number of water bottles that Charlotte sold was 31.
How to find the percentage from the total value?
Suppose the value of which a thing is expressed in percentage is "a' the percent that considered thing is of "a" is b%. Then since percent shows per 100 (since cent means 100), thus we will first divide the whole part in 100 parts.
We need to find the approximate number of water bottles that Charlotte sold
It can be written by



so, 62% of 50 is 31. However, it is to the nearest 10, it would be about 31 water bottles.
She sold about 31 water bottles.