517284 books have been sold to date.
Step-by-step explanation:
Given,
Copies sold in first month = 41900
This represents 8.1% of copies sold to date.
Let,
x be the number of copies that have been sold to date.
8.1% of x = 41900
[tex]\frac{8.1}{100}*x=41900\\0.081x=41900\\[/tex]
Dividing both sides by 0.081
[tex]\frac{0.081x}{0.081}=\frac{41900}{0.081}\\x=517283.95[/tex]
Rounding off to nearest whole number
x = 517284
517284 books have been sold to date.
Keywords: percentage, division
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