Please find the below attached question and give the answer properly.

13. Vishal Exports requires Rs.90 million in cash for meeting its transaction needs over the next three months, its planning horizon for liquidity decisions. Vishal Exports currently has the amount in the form of marketable securities. The cash payments will be made evenly over the three months planning period. Vishal Exports earns 8 percent annual yield on its marketable securities. The conversion of marketable securities into cash entails a fixed cost of Rs.4,500 per transaction. What is the optimal conversion size as per the Baumol model