Because of the recent increase in fuel prices, the price of food is more expensive than before.
This is obviously a direct translation of harganya lebih mahal!
This is really a collocation problem. The IELTS examiner will understand what you mean, but you will not receive a good score for vocabulary. A product or service can be expensive, but the price of the product or service is either high or low.
More correct collocation is as follows:
Meanwhile here’s a song illustrating some common collocations when talking about money.
Subscribe to GuruEAP for all the latest posts and other news! It's free, and you can easily unsubscribe when you're ready to move on.