Marco borrowed $150 from his brother. he has paid back 30% back so far. how much money does marco still owe his brother? pls explain how you got the answer,

Marco still owes his brother $105.  You get this answer by doing the following: Start by multiplying 150 * 0.3  (This is the same as multiplying by 30%).  You will get 45 for your answer. This number is how much Marco has paid his brother so far. Then subtract 45 from 150  (150-45) to find out how much more Marco has left to pay.  Your final answer will be $105.