500×5%=25 yuan is mainly calculated according to the first method because it can be seen that the mother's monthly income does not exceed that of 500 yuan.

2090

Dad: 90/ 10% 900 yuan.

500+900+ 1600=3000 yuan

The above are the steps, I hope to help you, please continue to ask if you don't understand, and I wish you progress in your study ~!