a. Pretend that the function diff does not exist. Implement the function on your own in a script file. Make the solution generic for any input vector.

b. You own a computer store that sells laptops of various brands. You are considering giving a 10% discount on the current prices. However, you are worried that if you give the discount you will lose in terms of revenue. You asked a forecasting firm to predict the next months sales (in quantity) with and without the discount. Using the data below, compute the revenues with and without a discount, and decide if you will proceed with the discount. You must use vector and/or matrix operations in the solution.

The script should print the revenue before & after and print a Boolean true (1) or false (0) for whether you will give a discount or not that will be computed for the specific input. You may solve for the specific example below. Here is the data you need for the analysis:

Prices:

Brand	Price Before Discount
P&H	1000
CAM	1200
LLED	1100
Microhard	1400

Forecasted quantities:

Brand	Quantities before Discount	Quantities after Discount
P&H	50	55
CAM	100	110
LLED	120	125
Microhard	30	50