Return specific formula based on information

[shorie7]

Hi all,

Need a little help here, I've tried and failed miserably.

Here's my problem.

My girlfriend needs a time schedule sheet for work.

The problem is this...

If she works half an hour she gets paid £10 per half.
If she works over half hour it becomes £16 per hour.

In columns B and C, I put the start and end times of work, formatted to "TIME", and in column F, I have a formula to multiply the work hours from column E, based on its value (multiply by £10 if half hour, by £16 if an hour)...and add the total for that week in F14.

I can't for the life of me however, find out how to return "zero" in column F if there's no start or end times entered in B and C.

It keeps returning £10....

Obviously then, the end of week balance (F14), is showing as £76...instead of only £26, as the other days when she DIDN'T work, still show a value of £10....when I want it to return zero....

Hope this makes sense.

I've been trying for 3 hours already but just can't crack it.

Any suggestions would be appreciated.

Workbook uploaded.