विजय दिन का 37.5% हिस्सा सोने में बिताता है। एक दिन में विजय कितने घंटे जागता रहता है?

A person saves 90% of his income. If his expenditure is ₹520, find his income (in ₹).

By how much is 30% of 60 greater than 25% of 40?

By how much is 30% of 50 greater than 35% of 30?