Final answer:
To write 19 kobo as a percentage of #3.89, divide 19 kobo by #3.89 and multiply the result by 100.
Step-by-step explanation:
To write 19 kobo as a percentage of #3.89, we need to divide 19 kobo by #3.89 and then multiply the result by 100 to get the percentage.
Step 1: Convert 19 kobo to naira by dividing it by 100 to get 0.19 naira.
Step 2: Divide 0.19 naira by #3.89 to get 0.0489.
Step 3: Multiply 0.0489 by 100 to get 4.89%.
Therefore, 19 kobo is 4.89% of #3.89.