1. A magazine subscription costs $90 per year at the beginning of each year, or $230 now for a three-year subscription. If the subscriber elects to pay the $230 now, a. What would be the incremental rate of return as compared to paying $90 in equal installments ( 3 installments) at the beginning of each year. b. If the MARR is 10% per year, which option would you select? Assume DN exists