Before the start of a campaign we generate an ROI estimate that includes revenue, traffic, cost per acquisition. Then we set out to achieve our estimated goal, in many cases exceeded projected levels. We usually target for a return on advertising spend of at least 700%.

Cost	Visitors	Conversion	Revenue	Profit	Cost/Responder	Cost / Convertor	Conversion ratio	ROAS
£100	1000	200	£2000	£1900	0.1	0.5	0.2	2000%

Above is an illustration of the return you could get from pay per click.