Annual depreciation rate =( 1-5%)/ 10=9.5%

Annual depreciation = 9.5% *150 =142,500 yuan.

Without cost, it is impossible to calculate profit.

Capital payback period:

Investment: 2.68 million.

Residual value: 75,000 yuan

Annual recovery rate: 360,000

Actual recoverable present value: 2.605 million.

If the benchmark interest rate is calculated at 8%

The payback period is about 1 1 year (equal repayment formula).

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In fact, the above calculation is problematic. I assume that the saving of 360,000 operating expenses is the answer from the return on investment, and the payback period calculated without detailed cash flow statement is also inaccurate (optimistic because operating costs and maintenance costs are not considered). But if the dust removal project has no recycling value, its investment profit cannot be defined.