The licences themselves are a modest, well-defined part of the budget — business registration, a food-shop licence, premises and fire approvals. The figure online is indicative at best and depends on your concept and location. The costs that actually decide the outcome are the lease and the working capital, not the licence — and in Singapore the lease is the sharper of the two.
From Singapore Restaurant Licence Cost: Every Fee, Explained — the full reading, with the method behind this answer.