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2t + 4b = 236 --> 2t + 4b = 236
t+b = 90 ---> 2t + 2b = 180
_______________ -
2b = 56
b = 28
t + b = 90
t = 90-28
= 62
harga = t x 1000 + b x 2000
=62.000 + 56.000
=118.000