A firm is considering of introducing a cash discount. The present credit terms are "net $40"$ and would like to change to $"1/15$ net $40".$ The current average collection period is $60$ days and is expected to decrease by $30$ days with the new credit terms. It is expected that $50\%$ of customers will take advantage of the changed credit terms. The firm's annual sales are of Rs$.60,00,000$ and it would remain unchanged. Its Contribution to Sales Ratio is $70\%.$ Further, the required rate of return is $15\%.$ Assume that corporate tax is $50\%.$