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2. 3 x 30 = 90
5 x 25 = 125
10 x 15 = 150
20 x 20 = 400
25 x 25 = 625
( 90 + 125 + 150 + 400 + 625 ) - ( 90 + 125 + 400 )
= 1390 - 615
= 775 ( B )
maaf kalau salah. semoga membantu
kalau nggak ngerti tanya aja