Blank cell in formula

Hello All,

I suspect this is a very simple question to some of you, but I simply don't know how to revise the formula to get the result i want.

In the attached spreadsheet if cell B9 is left blank then range D10:K10 returns zero. How do I revise the formula in cells D10:K10 so that if B9 is emply the cells F10:K10 returns the answer 5,000?

Thanks to anyone who can provide some assistance.