can any python experts help me with 3 questions code. i need to use if and else statement. Also use float, split, try, exept, int.

1. Filename: assign2-1.py Write a program that takes three grades as input, computes the weighted average assuming the weights are 15% 20% and 65% , respectively, determines the letter grade and produces the output shown below The output should change according to the grades entered Input: a python assign2-1py 96.7 95.6 87. b. python assign2-1.py 79.9 79.0 79.7 c. python assign2-1.py 70.0 70.0 70.0 Outpnt a. Average: 90.175 Letter Grade: Letter Grade : C Letter Grade : C b. Average: 79.59 c. Average: 70.0 2. Filename: assign2-2.py Write a program that takes a person's BMI as input, determines whether the person is underweight, normal weight, overweight or obese and produces the output shown below. The output should change according to the BMI entered. Determine a person's BMII category using the following underweight (BMI 18.5), normal weight (18.5 BMI25), overweight (2BMI