Qual é a taxa quadrimestral equivalente, em juros compostos, à taxa de 72,8% ao ano?

a) 10,0%

b) 18,2%

c) 20,0%

d) 30,0%

e) 36,4%

quadrimestre seira 4 meses

12 meses dividos por 4 = 3

olhando na tabela oferecida pela banca temos a resposta

n=3 

1,728

i=20%

letra c

n	10%	20%	30%	40%	50%
1	1,100	1,200	1,300	1,400	1,500
2	1,210	1,440	1,690	1,960	2,250
3	1,331	1,728	2,197	2,744	3,375
4	1,464	2,074	2,856	3,842	5,063
5	1,611	2,488	3,713	5,378	7,594
6	1,772	2,986	4,827	7,530	11,391
7	1,949	3,583	6,275	10,541	17,086
8	2,144	4,300	8,157	14,758	25,629
9	2,358	5,160	10,604	20,661	38,443
10	2,594	6,192	13,786	28,925	57,665
11	2,853	7,430	17,922	40,496	86,498
12	3,138	8,916	23,298	56,694	129,746