Answer :
In mathematical language, the problem is
In that bank, the rate of simple interest is 12%.
So, the interest of Rs. 100 in 1 yr is Rs. 12
The interest of Rs. 1 in 1 yr is Rs. 
⇒ The interest of Rs. 15,000 in 1 yr is 
= Rs. 1,800
⇒ The interest of Rs. 15,000 in 4 yr is 
= Rs. 7,200
The total interest paid by them = Rs. 7,200
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