66.
David sells his Laptop to Goliath at a loss of 20% who subsequently sells it to Hercules at a Profit of 25%. Hercules, after finding some defect in the laptop, returns it to Goliath but could recover only Rs. 4.50 for every Rs. 5 he had paid. Find the amount at Hercules' loss if David had paid Rs. 1.75 lakh for the laptop.

67.
The cost of servicing of a Maruti car at Maruti care Pvt. Ltd. is Rs. 400. Manager of service centre told me that for the second service within a year a customer can avail a 10% discount and further for third and fourth servicing he can avail 10% discount of the previous amount paid, within a year. Further if a customer gets more than 4 services within a year, he has to pay just 60% of the servicing charges on these services. A customer availed 5 services from the same servicing station, what is the total percentage discount fetched by the customer?

68.
A vendor sells his articles at a certain profit percentage. If he sells his article at $$\frac{1}{3}$$ of his actual selling price, then he incurs a loss of 40%. What is his actual profit percentage?

69.
Arun bought toffees at 6 for a rupee. How many for a rupee he should sell to gain 20%?

70.
The cost price of 19 articles is same as the selling price of 29 articles. What is loss percentage?

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