How do I calculate these to end up with the correct answer highlighted in Green?

A project with startup costs of $50000 is expected to produce revenues of $25000 in year 1. From there, the revenues are expected to increase by 10% a year until year 4, at which point the project ends. Costs are expected to be $12500 a year. Roughly, what is the minimum revenue growth needed in order to accept the project if the required rate of return is 10%? 10% 4% 8% 2% A project with startup costs of $50000 is expected to produce revenues of $25000 in year 1. From there, the revenues are expected to increase by 10% a year until year 4, at which point the project ends. Costs are expected to be $12500 a year and remain constant. If costs rise at a constant rate each year, what is the minimum rate of increase in costs which would cause the project to be rejected? Assume the required rate of return is 8%. 7% 6% 8% 9% A project with startup costs of $50000 is expected to produce revenues of $25000 in year 1. From there, the revenues are expected to increase by 10% a year until year 4, at which point the project ends. Costs are expected to be $12500 a year. Roughly, what is the minimum revenue growth needed in order to accept the project if the required rate of return is 10%? 10% 4% 8% 2% A project with startup costs of $50000 is expected to produce revenues of $25000 in year 1. From there, the revenues are expected to increase by 10% a year until year 4, at which point the project ends. Costs are expected to be $12500 a year and remain constant. If costs rise at a constant rate each year, what is the minimum rate of increase in costs which would cause the project to be rejected? Assume the required rate of return is 8%. 7% 6% 8% 9%