I need the correct answer and the explaination for this questions

Peter Chan has just acquired three houses by obtaining three mortgage loans. They all mature in 15 years and can be repaid without penalty any time before maturity. The amount owed and the annual interest rates associated with each mortgage loan are given in the following table. Peter can also combine the total of these three loans {that is, $1,444,000) and creates a consolidated loan from his wife. His wife will charge him 6.8% annual interest for 15 years. Should peter do nothing (leave the three individual loans as they are} or create a consolidated loan of $1,444.000