A clothing store uses a markup of 40% on all items they purchase to sell, find the markup is the original cost was 10.2 Please help I’m desperate

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

What is the slope of the equation y =