Bhavani Limited currently provides 40 days of credit to its customers. Its present level of sales is Rs. 200 million. The firms cost of capital is 14 percent and the ratio of variable costs to sales is 0.80. Bhavani is considering extending its credit period to 60 days. Such an extension is likely to push sales up by Rs. 30 million. The bad debt proportion on the additional sales would be 6 percent. The tax rate for Bhavani is 30 percent. What will be the effect of lengthening the credit period on the residual income of Bhavani Limited? Assume 360 days to a year.