How do you SUM a range and multiply only if the SUM of the range is a negative number?

How do you SUM a range and ONLY multiply if the SUM of the range is a negative number and have it return an absolute value of the final number other wise return a 0 if the SUM of the range is a positive number?

=0.15*SUM(B10:R10)

is what I have started out on, but not sure how to proceed.

One way:

=0.15*ABS(MIN(0, SUM(B10:R10))

Worked like a charm! Thank you!