please help with this

(a) Megha Ltd. was incorporated on 1.7.2020 to take over the running business of Mis Happy from 1.4.2020. The accounts of the company were closed on 31.3.2021. The average monthly sales during the first three months of the year (2020-21) was twice the average monthly sales during each of the remaining nine months. You are required to compute time ratio and sales ratio for pre and post incorporation periods