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Answer: 
Step-by-step explanation:
Given
Shopkeeper allows 15% discount on the marked price and still manages a profit of 7%
Suppose the marked price is 
So, the selling price is 
Suppose the cost price is 

So, the percentage the shopkeeper marked his goods above cost price

Answer:
I dont know why he was incorrect because you didn't show us it but the correct answer is 427.
Step-by-step explanation:
You will divide 16 into 6,832 then you will do 16 times 4 and it will give you 64 and you subtract that and you will get 43 and then do 16 times 2 and you will get 32 and you subtract 43 and 32 then you will multiply 16 times seven and you will get 112 and subtract that by 112 and you will get zero.
Just substitute the values of the domain for x one by one to find the range.
The range of the function is {7,11,20}