Mojo's Coffee Cart has a consistent contribution margin ratio of 55%. The company is purchasing new coffee roasters which will increase its fixed costs from $1,500 per month to $2,000 per month. Net income in August, before the purchase of the new roasters, was$3,000. What would monthly sales revenue need to be for the company to make the same net income in September after the purchase of the new roasters? Round to the nearest whole dollar.