At the beginning of the school year marilee had $480 in her bank account. that was only 15% of the amount in her bank account at the end of the school year. how much money was in her account at the end of the school year?

a good explanation would be appreciated!

Zed is making a centerpiece for his dining room table by putting sand in a cube-shaped vase. the vase is 0.25 meters in length, width, and height. he bought 25 kg of sand. assume the density of dry sand is 1,602 kgm3. what is the volume of the sand that zed purchased? the volume of the sand is approximately m3. enter your answer as the number that correctly fills in the blank in the previous sentence. if necessary, round your answer to six decimal places, like so: 42.536475