 
 <translate> 2% of $90 is (2 / 100) * $90 = $1.8. 2% of $60 is (2 / 100) * $60 = $1.2. The second transaction was reversed without the service charge so only a total of $90 + $1.8 + $1.2 = $93 was deducted from his account. He will have a balance of $400 - $93 = $307.
The final answer: 307. <ibo> 2% nke $90 bụ (2 / 100) * $90 = $1.8. 2% nke $60 bụ (2 / 100) * $60 = $1.2. E megharịrị azụmahịa nke abụọ n'akwụghị ụgwọ ọrụ ya, ya mere, e wepụrụ naanị $90 + $1.8 + $1.2 = $93 na akaụntụ ya. Ọ ga-enwe ego dị $400 - $93 = $307. Azịza ikpeazụ ya bụ: 307. 