Pham is saving money to buy new headphones. The headphones cost $200, but she has saved only 45% so far. How much more does Pham need to save to buy the headphones? please help giving brainlest it’s due in a few minutes (i have to show work so if you can please send an example)

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.