 
<translate> Tambayar ita ce: Sam ya zuba $10,000 kuma ya samu riba mai kashi 20% na shekaru uku. Sa'an nan kuma ya zuba jari har sai ya yi sau uku. A shekara ta gaba, ya samu riba 15% a kan jarinsa. Nawa ne yake da shi a yanzu? <eng> The question: Sam invested $10,000 and earned 20% interest compounded for 3 years. He then invested more until he had three times as much invested. The next year, he got a 15% return on his investment. How much money does he have now? 