You have money to invest for 10 years in Australia

You have money to invest for 10 years in Australia and are trying to determine whether to buy and hold a 10 year par bond with yield of 1.01% or to purchase a duration equal portfolio of 5 year par bond with yield of 0.40% and a 15 year par bond with yield of 1.327%. i) Calculate the (10 year par bond) duration equal weights and the cost of convexity associated with the 5 + 15 year portfolio.