I need this ASAP! What number? Increased by 130% is 69? FYI: the answer is less than 69

How to solve it and what thw answer is

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup