Solution:

Given,
Cost price (CP) = Rs 6000



Marked Price (MP) = CP(1 + 40%)

= CP ( 1 + \frac{40}{100})

= 6000 × \frac{140}{100}

= Rs 8400



Discount percentage (d%) = 20%

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

= MP ( 1 - \frac{20}{100})

= 8400 × \frac{80}{100}

= Rs 6720


And,
VAT percentage (VAT%) = 13%
SP with VAT = SP ( 1 + \frac{VAT%}{100})

= SP ( 1 + \frac{13}{100})

= 6720 × \frac{113}{100}

= Rs 7593.60

Hence, a customer should pay Rs 7593.60 with 13% VAT.

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