Final answer:
The amount of increment after John's salary was increased by 15% to RM5980 is the difference between the new salary and the original salary, which is calculated to be RM780.
Step-by-step explanation:
The student has asked to find the amount of increment after John's salary was increased by 15% to a new salary of RM5980. To find the salary increment, we can use the formula for percentage change, which is change in quantity divided by original quantity. In this case, we need to find the original salary before the increment was applied. The new salary (RM5980) is equal to 115% of the original salary. If we let the original salary be x, we can write the equation as 1.15x = RM5980. Solving for x, we find that the original salary before the increment was RM5200 (RM5980 / 1.15). The amount of the salary increment is therefore the difference between the new salary and the original salary, which is RM5980 - RM5200 = RM780.