Answer 1

\[\text { Given, } \]

\[\text { MP of the cycle = Rs } . 840 \]

\[\text { Discount = 10 % } \]

\[\text { So, SP = MP } \times \left( \frac{100 - \text { Discount % }}{100} \right)\]

\[ = 840 \times \left( \frac{100 - 10}{100} \right)\]

\[ = Rs . 756\]

\[\text { Now, SP = Rs . 756 and Gain = 26 % } \]

\[\text { So, CP }= \frac{100}{100 +\text {  Gain % }} \times 756\]

\[ = \frac{100}{126} \times 756\]

\[ = Rs . 600\]

\[\text { Hence, the actual cost of the cycle is Rs } . 600 .\]