The next model of a sports car will cost 12.4% more than the current model costs 57,000. how much will the price increase in dollars? what will be the price of the next model

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of