Solution:

Here,
SP with VAT = Rs 9040
Discount percentage (d%) = 20%
VAT % = 13%

To find: Marked Price (MP) = ?

We know,
SP = \dfrac{SP with VAT}{100 + \frac{VAT%}{100}}

= \dfrac{9040}{100 + \frac{13}{100}}

= 9040 × \dfrac{100}{113}

= Rs 8000


Now,
Marked Price (MP) = \dfrac{SP}{1 - \frac{d%}{100}}

= \dfrac{8000}{1 - \frac{20}{100}}

= \dfrac{8000}{\frac{80}{100}}

= 8000 × \frac{100}{80}

= Rs 10000


Hence, the required marked price of the bicycle is Rs 10,000.