Please show financial calculator key strokes

Show all your work in solving the problems. You don't need to provide formulas but do need to show all calculator keystrokes to get full credit for your answers. Part 1 You are buying a $350,000 home and are deciding between two fixed rate mortgage options. The 80% LTV option has an interest rate of 6% over 30 years. The 90% LTV option has an interest rate of 6.5% over 30 years with 2 discount points. What is the incremental borrowing cost when choosing the 90% LTV option over the 80% LTV option? . Why is the effective borrowing cost higher for the 90% LTV option