According to the mathematical formula, the rate of return refers to the rate of return on investment, that is, the ratio of investment income to investment cost.

Assuming that the rate of return is annualized, that is, the average rate of return within one year, the following formula can be used to calculate the income of one day: the income of one day = investment amount × rate of return ÷365. Substituting the data in the title into the formula, we get: single-day income =10000 * 0.0173 ÷ 365, and single-day income =0.4736 yuan.

Therefore, if the rate of return is 1.73%, the daily income of 1 ten thousand yuan is about 0.47 yuan.