Total marked price = Rs \((1,450 + 2 × 850)\) = Rs \((1,450 +1,700) \)= Rs \(3,150\)
Given that, \(discount\) % = \(10\) %
Discount = Rs \(\bigg(\frac{10}{100} × 3150\bigg)\) = Rs \(315\)
Also, \(Discount\) = \(Marked \;price - Sale \;price\)
Rs \(315\) = Rs \(3150\) - \(Sale \;price\)
∴ \(Sale \;price\) = Rs \((3150 - 315)\)
= Rs \(2835\)
Thus, the customer will have to pay Rs \(2,835\).