A) Rs.720
B) Rs.695
C) Rs.765
D) Rs.750
E) Rs.790
Correct Answer: D
Solution :
Let the cost price be Rs.\[x\]. Marked price \[=x\times \frac{\text{130}}{\text{100}}\text{=Rs}\text{.}\frac{13x}{10}\] Now, discount given is 20%. Then, selling price \[=\frac{13x}{10}\times \frac{80}{100}\] According to the question, \[780=\frac{13x}{10}\times \frac{80}{100}\] Or, \[x=\frac{780\times 10\times 100}{13\times 80}\] \[\therefore x=750\] Another Method: \[\text{CP=100}\] Then, MP=130 Now, \[\text{SP=130}\times \frac{80}{100}=104\] \[\because 104\equiv 780\] \[\therefore 100\equiv \frac{780}{104}\times 100=\text{Rs}\text{.750}\]
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