Help a. Calculate the durations of the two bonds in Spreadsheet 111 if the market inter calculations. Round your answers to 4 decimal places.) est rate increases to 12%, (Do not round interm Duration of 8% coupon bond year of z year b. Use Spreadsheet|11 to calculate the duration of the coupon bond if the coupon were 12% instead of 8%. The interest rate rema 12%. (Do not round intermediate calculations. Round your answer to 4 decimal places.) Duration of 12% c year Prey 8 of 10 Next SPREADSHEET 11.1 of the duration of two bonds using Excel are avallable In Connect 10000 0.1