Question 971002
let the number of tapes = x

Cost is 8100 + (0.30) x, units in dollars.

Revenue is 3x

8100 +0.30 x > 3x  (profit is what is requested, not break even)

8100 >2.70 x, subtracting 0.30 x from both sides

divide by 2.70

x > 3000

At 3000 tapes, the cost is 8100 (0.3)*3000=$9000

3000 tapes at $3/tape =$9000

The answer is 3001. or >3000
Both work
It is C.