 <translate> Jon decides to take up baseball. He can throw a fastball at 80 miles per hour.  He goes through intense training 4 times for 4 weeks each time and at the end of the last one he can throw a ball 20% faster. How much speed (in mph) did he gain per week, assuming he gained an equal amount of speed (in mph) each week? Give me reasons, before answering the question <yor> Jon pinnu láti máa gbá bọ́ọ̀lù baseball. Ó lè ju bọ́ọ̀lù tó yára gan-an ní ọgọ́rin kìlómítà ní wákàtí kan. Ó gba ìdánilẹ́kọ̀ọ́ gbígbóná janjan ní ìgbà mẹ́rin fún ọ̀sẹ̀ mẹ́rin ní ìgbà kọ̀ọ̀kan àti ní òpin ìdánilẹ́kọ̀ọ́ tó kẹ́yìn ó lè ju bọ́ọ̀lù lọ ní ìdá 20 nínú ọgọ́rùn-ún. Báwo ni ìyára tó ń sáré ṣe pọ̀ tó lọ́sẹ̀ kan, ká sọ pé ó ń sáré tó bákan náà lọ́sẹ̀ kọ̀ọ̀kan? Sọ ìdí tó o fi ṣe é, kó o tó dáhùn ìbéèrè mi. 