Sameera spend 90%of her income and donated 3% for socially useful causes. If she left with Rs.1750 at the end of the month what was her actual income?

Dear Student,

$$\begin{gathered} Let x be her actual income. \\ Sameera spent 90\% of her income and donated 3\% of her income to socially useful causes. \\ She is then left with Rs. 1750. \\ So, \\ x - 90\% of x - 3\% of x = Rs. 1750 \\ x - \frac{90}{100}\times x - \frac{3}{100}\times x = Rs. 1750 \\ x - \frac{90x}{100} - \frac{3x}{100} = 1750 \\ x - \frac{93x}{100} = 1750 \\ \frac{100x - 93x}{100} = 1750 \\ \frac{7x}{100} = 1750 \\ x = \frac{1750\times 100}{7} \\ x = Rs. 25000 \\ So, her actual income is Rs. 25000 \end{gathered}$$

Regards