how much is 2.8 percent increase

A 2.8% increase means the new value is 1.028 times the original value. For example, if you had 100, a 2.8% increase would be 100 × 1.028 = 102.8. If you want to apply this to a specific number, multiply that number by 1.028. If you’d like, share the original amount and I can compute the new value directly.