Question

Please help me ASAP:

Answer 1

The answer to this problem is 300%

Answer 2

If the first increase was 50%, that means that the price between the first and the second increase is 150% of the original. And as you need 6 (which is 4*150%) times the original, the price was increased for 450%. So, the last peecent increase is
$\frac{450}{150} \times 100\% = 300\%$