# Percentages not showing correctly

#### SteveT1811

##### New Member
Hi,

First post so apologies if this has been answered before, I have a margin calculator at take into account a yearly or monthly cost, a possible install and then a sell cost, this then works out a yearly percentage of margin, for 3 years. However the percentages are incorrect and I cant find where the error is. AN example and screenshot is below

Monthly Cost £403.84 (£4846.08 per annum)
Monthly Charge £484.60 (£5815.20 per annum)
The percentage of the margin is 20% (£403.84 x 1.2 =£484.60)

The excel book is showing this as a margin percentage of 16.67% and I cant figure out from the formula where it is wrong (the formula was created by someone else who is no longer with the company)

I have included the detail below the supplier is in column 8B and the formula for column J8 is below

=IFERROR(SUM(((I8*12)+(H8))-(E8+(F8*12)+(G8)))/((I8*12)+(H8)), 0)

 COSTS / BUY PRICE / SELL ITEM Supplier Product / ITEM Term Months ANY NON RECURRING CHARGE ANY MONTHLY RECURRING CHARGE(s) ANY ANNUAL RECURRING CHARGE(s) NON RECURRING CHARGE MONTHLY RECURRING CHARGE TOTAL FIRST YEAR MARGIN TOTAL SECOND YEAR CUMLATIVE MARGIN TOTAL THIRD YEAR CUMLATIVE MARGIN TERM MARGIN @ 36 MONTHS TCV £ PROFIT over TERM 1 Vodafone 50/100 36 £0.00 £4,846.08 £0.00 £484.60 16.67% 16.67% 16.67% 16.67% £17,445.60 £2,907.36

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#### jasonb75

##### Well-known Member
The formula is not wrong, your margin is 16.666667%, your mark up is 20%.

Mark up = profit as percentage of cost price.
Margin = profit as percentage of sale price.

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