Textbox to enter value in either format

On the attached example i have a user form (click Add New Hedge button) and on this form is a textbox for 'Avg. Price'. The value of entered from this box will go into the next available row in column on 'Unsettled Hedges' worksheet.

My problem is sometimes i would to enter the price as a fraction, e.g. 1/2 and other i would like to enter the price as a decimal, e.g. 1.5. At the moment if i enter the price as a decimal figure this will convert it to a fraction in column D of the 'unsettled hedges' worksheet.

What do i need to change in my code to make it enter the price in either format?

Thanks,
Adam.