I need some help with these

A fruit merchant earns a profit of Rs.10 per bag of oranges and a loss of Rs.5 per bag of grapes sold. If he sells 200 bags of oranges and 350 bags of grapes, find the total profit/loss.

In a test (+5) marks are given for every correct answer and (-3) marks are given for every incorrect answer and 0 for answer not attempted. Neha gets 4 correct and 3 incorrect out of 7 questions she attempted. What is her score?

The weight of an object on Moon is 1/6 its weight on Earth. Find the weight of the object on Moon which weighs 28/5 Kg on Earth.

Find 3/4 of 5/7

It'd really help me out if anyone answers this!!

1) A profit of Rs.10 per bag of oranges and a loss of Rs.5 per bag of grapes sold. The total profit/loss from selling 200 bags of oranges and 350 bags of grapes is:

total profit/loss = 200 (10) - 5(350) = 2000 - 1750 = Rs 250

A profit of Rs 250 is made.

2) (+5) marks are given for every correct answer and (-3) marks are given for every incorrect answer and 0 for answer not attempted. If he answer 4 correct and 3 incorrect out of 7 questions. His score is:

Score = 5(4) - 3(3) = 20 - 9 = 11 marks

His score is 11 marks

3) An object weighs 28/5 kg on earth. Since its weight on moon is 1/6 its weight on Earth.

The weight on moon = 1/6 × 28/5 = 14/15 kg

4) 3/4 of 5/7 = 15/28