A$40 backpack is in sale for $28. what is the % of change

$ 40 ..... 100 %
$ 28 ..... x %



The % of change is 70 %.

This is equivalent with:
- the final price ($ 28) is 70 % from the initial price ($ 40)
- the initial price ($ 40) was reduced with 30% giving the new price as:

Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.

The answer to your question is 1/9