A shopkeeper fixed the price of a pen to make a profit of 10%. But he sold it allowing a discount of Rs 7.50 and lost 5%. At what price did he purchase the pen?

plz give correct solution

Is it true that product of 3 consecutive natural numbers is always divisible by 6? justifyyour answer

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Researchers are conducting experiments to determine the role of alcohol in the development of depression. after the study is complete, they determine that the relative risk of developing depression is 1.55 with a 95 % ci of 1.2 -1.9. each group is then divided into nonsmokers and smokers. the relative risk for the nonsmokers is 1.12 with a 95% ci of 0.87-1.37. the relative risk for the smokers is 1.7 with a 95 % cl of 1.5-1.9. what type of bias may affect this study? a. procedure bias b. recall bias c. selection bias d. confounding e. lead-time bias