Hello Aaryan,

You have not told us the original marks you scored in biology. But we can help you find the new percentage. 

Let us assume you found X marks in biology originally. 

Follow the steps and calculate the percentage yourself. 

1. Subtract your original marks from the total initial marks and add the new marks to it like (249-X+74)

2. Whatever you get from step one, divide it by 5. Like, (249-X+74)/5

And you have your percentage.