# Options Set To Increase Price By % Not Calculating Properly

Hello

I have a website that is using % increases on some options. But the correct totals are not being reached.

For example, this shed costs Â£910.78 in size 12x8.

This is worked out from a base price of Â£394.66 for the smallest option with a modifier for Â£ set at Â£516.12 for the 12x8 size.

[url=https://postimg.cc/n9ZMYZdn][/url]

[url=https://postimg.cc/2VShPFwr][/url]

This brings the price to Â£910.78.

The next option is Heavy Duty and the modifier is a % of +25%. This brings the price, incorrectly to Â£1009,45.

[url=https://postimg.cc/jLndwDqy][/url]

The actual price should be Â£1,138.47

Why are the prices not being worked out correctly?

Ok so whats its actually doing is only putting the +25% on the base price - not the base price + first option (size).

How do I get the options to work out a price from the base price + any previously set option?

Like this

Base Price - Â£394.66

First Option - Size 12x8 Â£516.12 + Base Price Â£394.66 = Â£910.78

Second Option - Increase Â£910.78 by 25% (not just the base price of Â£394.66)

etc

Anyone!?