A company leases office equipment for an original sale price of 18000 for 400 per month. The lease has an option to buy. 50% of the monthly lease price can be applied to the purchase price, up to 30% of the original sales price. If the company purchases the equipment in less than 2 years, the original sales price will be reduced by 10%. How much will the company owe on the equiqment if they buy it after 15 months?