Alex spend $29.02 last week.
What is Unitary Method?
The unitary technique involves first determining the value of a single unit, followed by the value of the necessary number of units.
For example, Let's say Ram spends 36 Rs. for a dozen (12) bananas.
12 bananas will set you back 36 Rs. 1 banana costs 36 x 12 = 3 Rupees.
As a result, one banana costs three rupees. Let's say we need to calculate the price of 15 bananas.
This may be done as follows: 15 bananas cost 3 rupees each; 15 units cost 45 rupees.
We have,
Alex spent $25.82 for groceries this week, which is $3.20 less than what Alex spent last week.
let she spend $x last week.
So, x - 3.2 = 25.82
x = 25.82+ 3.2
x = $29.02
Learn more about Unitary Method here: