Let the man invest ₹ x in the company
For company A
N.V of each share = Rs 100
M.V of each share = Rs 100 + 20% of Rs 100 = ₹ 120
Number of shares bought =x120 [∵investment of ₹.x]
Dividend on each share = 8% of ₹ 100 = ₹ 8
Total dividend =₹8× x120=₹.x15
For company B
N.V of each share = ₹ 100
M.V of each share = ₹ 100 - 10% of ₹ 100 = ₹ 90
Number of share bought =x90 [investment ₹x]
Dividend on each share = 7% of 100 = ₹ 7
Total dividend =₹.7×x90=₹7x90
Given, sum of dividend from both companies = ₹ 936
x15+7x90=936 i.e. x = 6480
The man invested ₹ 6480 in each of the two companies
The man invested x all =2×₹6480=₹12960