After-tax interest

1. What is the after-tax present worth of a chip placer if it costs £55 000 and saves £17 000 per year? After-tax interest is at 10%. Assume the device will be sold for a £1000 salvage value at the end of its six-year life. The corporate income tax rate is 54%.
2. What is the exact after-tax IRR on a two-year project for which the first cost is £12 000,
savings are £5000 in the first year and £10 000 in the second year, and taxes are at 40%?

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