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5,6 x 5 = 28
28 + 5 = 33
33 / 5 =6,6
9.
48 x 60 = 2.880
50 x 60 = 3.000
3000 - 2.880 = 120
y - n = 10
y = 10 + n
y + n = 120
(10+n) + n = 120
2n = 120 - 10
n =110/2 = 55
y = 10+55 = 65
10.
90+100+110+120+130+140+150+160+170+180+190+200 = 1.740
1.740/12 = 145
jadi keuntungan tiap bulannya 145