Serendipity Cafe is thinking of expanding and opening a new location. It estimates the following expenses and profits for this multi$-$year project:

Timeline Cash flow

Beginning of Year $1,$ or today $$$$6,200$

In $1$ year $4,600$

In $2$ years $5,200$

In $3$ years $3,200$

a$.$ At $0$ percent required return, the NPV is $\_\_\_\_\_\_.$

b$.$ At $10$ percent required return, the NPV is instead $\_\_\_\_\_\_.$

c$.$ At $19$ percent required return, the NPV is instead $\_\_\_\_\_\_.$

d$.$ At $24$ percent required return, the NPV is instead $\_\_\_\_\_\_.$