Clare purchases a single product for 15 and sells it for 30. Forecasted sales for the next three months are July 4,000 units, August 6,000 units, September 7,500 units. Clare's policy is to have an ending inventory of 40. What will be the total revenue from sales for the next three months?
1) $60,000
2) $90,000
3) $120,000
4) $150,000