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*maaf kalau salah
2p + 2l = 40
2(l+4) + 2l = 40
2l + 8 +2l = 40
4l +8 = 40
4l = 32
l = 8 cm
p = l+4 = 8 + 4 = 12 cm
L = p.l = 12 x 8 = 96 cm2
2. bilangan kelipatan 4 kurang dari 70 : ( 4, 8, 12, ..., 68)
Un = 68
a + (n-1) b = 68
4 + (n-1) 4 = 68
(n-1) 4 = 64
n-1 = 16
n(1) =17
Bil. kelipatan 4 yg habis di bagi 6 dan kurang dari 70 : (12, 24, 36, 48, 60)
n(2) = 5
maka banyak anggota :
n = n(1) - n(2) = 17-5 =12 anggota
3. harga sebelum diskon : 100.000 (harga asli)
harga setelah diskon : 85.000
besar diskon : 15.000 (diskon)
% diskon = diskon / harga asli x 100% = 15.000/100.000 x 100% = 15%