You should know how to ............
So we are assuming that the three shirts have equal price. Let the price of one shirt be a.
In store A:
the cost is (a+a+a) -(25/100)a=3a-0.25a=2.75a
In store B:
the cost is : a+a+50/100 a =a+a+0.5a=2.5a
In store C:
the cost is
[a-(10/100)a]+[a-(10/100)a]+[a-(10/100)a]=[a-0.1a]+[a-0.1a]+[a-0.1a]
=0.9a+0.9a+0.9a= 2.7a
thus the cost of buying the shirts from stores A, B and C is:
2.75a, 2.5 a and 2.7 a respectively.
the best deal, is buying from store B, where the cost is the lowest: 2.5a.
Answer: store B
3. it would be 15 because it is multiplying by 3
4. it would be 11 because it's subtracting 2
Responda:
R $ 15.600
Explicação passo a passo:
Deixe a dívida inicial = x = 100%
% pago = 20% = 0,2x
% esquerda =. 100% - 20% =. 80% = 0,8x
35% da dívida restante = 0,35 * 0,8x = 0,28x
Conseqüentemente,
0,28x = 4368
x = 4368 / 0,28
x = R $ 15.600
Logo, o valor inicial da dívida = R $ 15.600