tolong di jawab sama caranya

2. waktu = 52,30 - 49,86 = 2,44 detik
(a)

3. penurunan = (25-20)/25 x 100% = 500/25 %
= 20%
(c)

4. kenaikan = 8.000 x 20% = 1.600
harga = 8.000 + 1.600 = 9.600
(c)