a) Rs. 8000
b) Rs. 9000
c) Rs. 10000
d) Rs. 12000
Answer: a
Explanation:
$$\eqalign{
& {\text{Let the sum be Rs}}{\text{. }}x \cr} $$
$$ {\frac{{x \times 8 \times 4}}{{100}}} + {\frac{{x \times 10 \times 6}}{{100}}} \,+ $$ $$ {\frac{{x \times 12 \times 5}}{{100}}} $$ $$ = 12160$$
$$\eqalign{
& 32x + 60x + 60x = 1216000 \cr
& 152x = 1216000 \cr
& x = 8000 \cr} $$
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