usually its 5 x monthly taking, so if its 200 a fortnight, you'd get 2000, or if its 500 a month = 5000, but thats if its paying well and compact, ie not less than 20-25 hr, any less you may have to drop price, and if its really good, 30 + an hr, you may even be able to get more! ive known rounds that are rubbish (£3 houses) go for 14-15 times!!