A book sold 31,300 copies in its first month of release. Suppose this represents 7.9% of the number of copies sold to date. How many copies have been sold to date?
Round your answer to the nearest whole number.

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!