9. Revenues from 09.2019 to 12.2019 will be:

$$
(55000+45000+10000+17400) * 4=509600 \text { rubles }
$$

Expenses from 09.2019 to 11.2019 will be:

$$
(40000+20000+5000+2000+2000) * 4=276000 \text { rubles }
$$

By 12.31.2019, the family will have saved $1147240+521600-276000=1340840$ rubles and will be able to buy a car.
Answer: The family can save up for a car by two years, by 31.12.2019.

## Maximum 30 points

## Criteria: