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-60 + 13 = -47 (d)
2) kalau gak salah 6800 x 1/100 = 68 (yang ini saya agak lupa) maaf :(
3) 2 jam = 7200 dtk, 20 menit= 1200dtk
7200 dtk + 1200 dtk - 9900 dtk = -1500 (jawabannya (-) )
4) 10800 detik = 3jam, 240 menit=4jam
3 jam + 4 jam = 7 jam (c)