Question

Can someone help me

Answer 1

Price increase = (new number - original number) / original number....* 100
                       = (2.89 - 2.84) / 2.84...* 100
                      = 0.05 / 2.84....* 100
                      = 0.0176 ...* 100
                      = 1.76  rounds to 1.8% <===

Answer 2

2.89-2.84 = 0.05 cent increase

0.05/2.84 = 0.0176

0.0176 = 1.8% increase