The price of a packet of salt goes up by 9 cents. The old price is four-fifths of the new price. Find the old and new prices. Show the calculations.

old 36 cents

new 45 cents

So isolate the variable on the left side by dividing both sides by 4/5:

4/5*5/4n = 5/4*9

on the left 4/5 and 5/4 cancel each other out and you end up with:

n = 5/4*9 = (5*9)/4 = 45/4 = 11 1/4 or 11.25

The price of a packet of salt goes up to 9 cents.The old price is four-fifths of the new price.Find the old and new prices. [Hint:let the old price be n cents.So the new price is n+9 cents\

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

step-by-step explanation: i dont