Final answer:
According to the given information, Harish invested Rs. 5940 and not any of the provided options.
Step-by-step explanation:
Let's assume that the amount Suresh invested is x rupees.
According to the given information, Suresh invested 10% less than Harish, so Harish invested x + (10% of x) = x + 0.1x = 1.1x rupees.
Ramesh invested 20% more than Suresh, so Ramesh invested x + (20% of x) = x + 0.2x = 1.2x rupees.
The total sum of their investments is given as 17880 rupees, so we can write the equation:
x + 1.1x + 1.2x = 17880
Combine like terms:
3.3x = 17880
Divide both sides by 3.3:
x = 17880 / 3.3
Solve for x:
x = 5400
So Suresh invested 5400 rupees and Harish invested 1.1x = 1.1 * 5400 = 5940 rupees.
Therefore, Harish invested Rs. 5940 which is not provided in the options. Hence, we can conclude that the given options are incorrect.