Answer:
Minimum 22 scarves Jenny has to sell in order to make a profit.
Step-by-step explanation:
Let the number of scarves knitted be 'x'.
Then cost price of the scarves = $ (160+4.5x)
Total selling price of the scarves = $ 12x
In order to attain a profit selling price > cost price
Therefore 12x > 160+4.5x
⇒12x - 4.5x > 160
⇒7.5x > 160
⇒ x >160÷7.5
⇒x > 21.33
SO minimum number of scarves should be 22 a whole number.