Policies offered by an insurer in an exemplary line of business have a coverage period of one year. Below there are aggregate amounts of premium written in this line of business during first half of 2021, second half of 2021, first half of 2022, and during July and August 2022. Calculate the premium reserve as of 31 August 2022. Year Premium written Assume that: 2021 First half 33 2021 Second half 36 2022 First half 42 2022 July&August 18 premium written is evenly distributed over the period of each half year, and also evenly distributed over the period of July and August 2022, claims are evenly distributed over the 12-month period of policy's validity