Answer:
Hence, the cost of the juice has decreased by 9.44%.
Step-by-step explanation:
Let's assume the cost of orange juice per unit be $x.
So, the cost of pomegranate, carrot and litchi per unit will be $4x, $5x and $6x respectively.
Before the price change, the total cost of the juice was:
$3x + 4x + 5x + 6x = 18x
Now, the cost of orange increased by 10% to $1.1x, the cost of pomegranate decreased by 20% to $3.2x, the cost of carrot decreased by 30% to $3.5x, and the cost of litchi increased by 40% to $8.4x.
So, the total cost after the price change would be:
$1.1x + 3.2x + 3.5x + 8.4x = 16.2x
The percentage change in the cost of juice can be calculated as:
(16.2x - 18x)/18x * 100 = -9.44%
Hence, the cost of the juice has decreased by 9.44%.