20k could mean 20000
so 20k + 50 = 20050
Or if k is a variable, 20k + 50 can be reduced to 10(2k+5) or similar.
The question is ambiguous.
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I don’t know
65 + 65 + 65 + 90 + 90 + 90 + 90 + 50 + 50 + 50 + 50 + 50 + 50 + 20 + 20 + 20 + 20 + 20 + 20 + 20 = 995
70 + 70 + 50 + 50 = 240
-50 plus 50 equals 0
50 plus 50 plus 50 equal 150