The Monthly Sales Volume Y (In Thousands of Dollars) Is $y = \frac { 100 x } { x + 10 }$

Multiple Choice

The monthly sales volume y (in thousands of dollars) is related to monthly advertising expenditures x (in thousands of dollars) according to the equation $y = \frac { 100 x } { x + 10 }$ Spending how much money on advertising will
Result in sales of at least $50,000 per month?

A) At least $5000
B) Between $5000 and $10,000
C) At least $10,000
D) At least $7500