I am trying to write a fomula which will look at the current conversion rate for samples sent to replies received, take the target for replies received for next year and use it to work out how many samples need to be sent to gain the required number of replies.
The attached spreadsheet shows the manually-calculated results in red, but I want to automate this sum.
My brain will not work out the maths I need to do - can someone help?
Thanks G
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