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be-licious

Maths calculations - costings

if i have 15000 letters to send and it will cost me ?5000. and i receive 1600 enquiries how much does it cost per enquiry...how do i calculate this type of maths? can some1 give me step by step...
00:45 Tue 04th Aug 20091 answer, last by Wak 14:15 Fri 07th Aug 2009

Only 1 question