At one store, matt saved $15 with a coupon for 30% off his total purchase. at another store, the 24$ he spent on books is 48% of his total bill. how much did matt spend in all at he stores ?

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.