a) Rs. 650
b) Rs. 350
c) Rs. 550
d) Rs. 500
Answer: c
Explanation: Let the amount invested = Rs. P
$$\eqalign{
& {\text{P}} + \frac{{{\text{P}} \times 10 \times 4}}{{100}} = 770 \cr
& {\text{P}} + \frac{{4{\text{P}}}}{{10}} = 770 \cr
& \frac{{14{\text{P}}}}{{10}} = 770 \cr
& {\text{P}} = \frac{{770 \times 10}}{{14}} \cr
& {\text{P}} = {\text{Rs 550}} \cr} $$
Required invested amount = Rs. 550
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