Ashopkeeper sold a book for rs.40 and gets 15% profit. if he wants to get 20% profit then what will be the actual price of book? ?

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Jonathan pays $1.90 per pound for potatoes. he buys 8.3 pounds of potatoes. he determines that he will pay $15.77, before tax, for the potatoes. which best describes the reasonableness of jonathan’s solution? jonathan’s answer is reasonable because there are two decimal places in the factors and two in the product. jonathan’s answer is unreasonable because there are three decimal places in the factors and two in the product. jonathan’s answer is reasonable because is 16, and 16 is close to 15.77. jonathan’s answer is unreasonable because is 8, and 8 is not very close to 15.77.

Need on this geometry question. explain how you did it.