The statement of cash flows shows the following information:
Cash provided by operating activities of $ 16,700
Cash used by investing activities of $ 8,200
Cash used by financing activities of $ 2,700
The beginning cash was $14,400. What is the amount of cash at the end of the period?

a. $31,100.
b. $20,200.
c. $8,600.
d. $42,000.