I want to have prices that end in #58 or #98. So I need a formula that takes
a cost price of something and multiplies by 2.5 and then rounds it to a price
that ends in 58 or 98. The final price could be as low as 58 and up to a 5
figure number ending in either of those 2 options which ever is the closer.
If a figure were to fall at the half way mark ie 70 then it should round up
to the 98.

Hope this clear and thanks Eqa.