Answer:
The shirt cannot be more expensive than $40
Explanation:
So, the budget here is $140
Let, the price of the shirt be x, so since the jacket is 2 times the price of the shirt :

But the other condition is that it is 20 dollars more than twice the shirt so we get:

Then the cost of the jacket and the shirt should not be more than $140 so:

So, to find the highest possible cost we solve for x:
