The rates of simple interest in two banks `A` and `B` are in the ratio 5:4. A person wants to deposit his total savings in two banks sin such a way that he received equal half-yearly interest from both. He should deposit the savings in banks `A` and `B` in the ratio: (a) 2 : 5 (b) 4 : 5 (c) 5 : 2 (d) 5 : 4