in high school i took all the sewing classes, the family and hom development classes, algebra, and geometry. we also had a class specifically called interior design. you need your math classes for measurements and plus geometry is good for when you are laying out furniture and hanging wall decor. that way you get the basic shape of how you want your room and all the measurements to make it look right. im not sure how much they make. im sure its pretty good. depends on where you are a designer. i wanted to be one when i was in high school. took all the perfect classes, i just never persued. good luck though and best wishes!
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