Shalini bought a phone and a tablet for ₹8,000 in all. She sold the phone at a 10% loss and the tablet at a 15% profit, and made a 5% profit overall. What did the phone cost her?

Explanation

1. 01

   Write the loss as −10% and apply alligation to −10% and +15% around +5%.

2. 02

   Phone : tablet = $(15 - 5)$ : $(5 - (-10)) = 10 : 15 = 2 : 3$.

3. 03

   Phone = $\frac{2}{5} \times 8000 = 3200$ rupees.