kak tolong dibantu no 4 yaa

bil. arman = 3,25×bil. arif
8⅛ = 3¼ × bil. arif
65/8 = 13/4×bil Arif
65/8×4 = 13 bil arif
13 bil arif = 65/2
bil arif = (65/2)/13
bil arif = 65/26
bil arif = 5/2
bil arif = 2½