Vishal and Param each sold their article at ₹1,818 but Vishal incurred a loss of 10%, while Param gained by 1%. What is the ratio of the cost price of Vishal's article to that of Param's article?

101 : 90

Given = Vishal and Param each sold their article at 1,818 but Vishal incurred a loss of 10%.

90% of the CP = 1818

100% of the CP = 2020

Cost price of the article for Vishal = 2020

while Param gained by 1%.

Cost price of the article for Param  =

101% of CP (param)= 1818

100% of CP (param)= 1800

Ratio of the cost price of Vishal's article to that of Param's article

= 2020 : 1800

= 101 : 90