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If you take budget hotels and open for local food ,you may have to spend around 50k max.You can travel everywhere in metro(MRT) and use Klook to book all tickets.(universal studio, cloud forest etc).
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Accommodation - This is one of the most expensive thing in Singapore. So excluding that and flights, the remaining things are food - travel - entry tickets. Food - There are plenty of Indian restaurants in the heart of the city with descent prices. Every tourist attraction has a restaurant, however food is expensive. Carry snacks and a water bottle before venturing out for the day. Tourist attractions - There are a lot of places to cover - Botanical Gardens, Gardens by the Bay, Marina Bay Sands, Sentosa, Singapore Flyer, City Tour, Zoo, Night safari, Bird Park, Underwater world etc. Instead of buying individual tickets, go for a comprehensive ticket covering most attractions to get best discounts. You can even book those tickets online as they come with 15-25% discounts. That way it should be within 20000 INR/person (40k for two people)
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