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Net finance costs (Tables) | 12 Months Ended
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Jun. 30, 2018
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Summary of Net Finance Costs |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$M |  |  | US$M |  |  | US$M |
Financial expenses |  |  |  |  |  |  |  |  |  |  |  |
Interest on bank loans, overdrafts and all other borrowings |  |  | 1,168 |  |  |  | 1,130 |  |  |  | 969 |
Interest capitalised at 4.24% (2017: 3.25%; 2016: 2.61%) (1) |  |  | (139 | ) |  |  | (113 | ) |  |  | (123 | )
Discounting on provisions and other liabilities |  |  | 414 |  |  |  | 450 |  |  |  | 304 |
Fair value change on hedged loans |  |  | (265 | ) |  |  | (1,185 | ) |  |  | 1,444 |
Fair value change on hedging derivatives |  |  | 329 |  |  |  | 1,244 |  |  |  | (1,448 | )
Exchange variations on net debt |  |  | (19 | ) |  |  | (23 | ) |  |  | (24 | )
Other financial expenses |  |  | 79 |  |  |  | 57 |  |  |  | 28 |
|  |  | 1,567 |  |  |  | 1,560 |  |  |  | 1,150 |
Financial income |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  | (322 | ) |  |  | (143 | ) |  |  | (137 | )
Net finance costs |  |  | 1,245 |  |  |  | 1,417 |  |  |  | 1,013 |
(1) | Interest has been capitalised at the rate of interest applicable to the specific borrowings financing the assets under construction or, where financed through general borrowings, at a capitalisation rate representing the average interest rate on such borrowings. Tax relief for capitalised interest is approximately US$42 million (2017: US$34 million; 2016: US$37 million).

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