Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
A married couple opened a savings account. The wife committed to saving $100 every week while the husband committed to saving $225 every month. After 4 months of savings, they decided to invest half of their money in buying stocks. Each share of stocks costs $50. How many shares of stocks can they buy?

### Response:
 Mke anaokoa $100/kila wiki x 4 wiki/mwezi = $400 kwa mwezi.
Pamoja, mke na mume wanaokoa $400+$225 = $625 kwa mwezi.
Katika miezi 4, akiba yao yote ni $625/mwezi x 4 miezi = $2500.
Wanakusudia kuokoa $2500/2 = $1250 zaidi ili kufikia $2500.
Hivyo, wana $2500 - $1250 = $1250 waliyookoa ambayo wanaweza kutumia kununua hisa.
Hivyo, wanaweza kununua $1250/$50 = 25 hisa.