Capitalization of borrowing costs

B Corp obtained a $1million 10% construction loan to finance the completion of its new premises on 1/1/17. The company paid the contractors $400,000 on 1/1/17 and another $600,000 on 7/1/2017. The unused portion of the loan was invested at an interest rate of 5% per annum between 1/1/13 and 6/31. The property was completed on 12/12/17.

Required: calculate the amount of the avoidable borrowing costs that should be capitalized as part of the qualifying assets cost at 12/31/17 under:

1. U.S. GAAP
2. IFRS

In your opinion, which treatment provides the most relevant information for investors?