Average = (150+200+100+130)/4 = 580/4 = 145
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(150 + 200 + 100 + 130) ÷ 4 = 145
150 + 200 + 100 + 130 = 580
-50 - 200 + 100 + 200 - 150 = -100. Your answer is -100. I hope I've helped you.
200
200 minus 25% = 785% of 200 = 200*75/100 = 150