기업업무추진비 계산접근방법 질문입니다.

<p style="text-align: left;"></p><div class="imagegridblock" data-ke-type="imageGrid"><div class="image-container"><span data-url="https://t1.daumcdn.net/cafeattach/8Ms/33e2948f415aa8524eb745e319cdf24cace3a502_re_1736942137765" data-origin-width="1714" data-origin-height="2498" style="width:41.48%; margin-right: 10px;"><img src="https://t1.daumcdn.net/cafeattach/8Ms/33e2948f415aa8524eb745e319cdf24cace3a502_re_1736942137765" class="txc-image-grid"></span><span data-url="https://t1.daumcdn.net/cafeattach/8Ms/db0c796129a1818710f5cfff5be0ea864dd568c2_re_1736942137764" data-origin-width="1764" data-origin-height="1822" style="width:58.52%; "><img src="https://t1.daumcdn.net/cafeattach/8Ms/db0c796129a1818710f5cfff5be0ea864dd568c2_re_1736942137764" class="txc-image-grid"></span></div><div class="image-container"><span data-url="https://t1.daumcdn.net/cafeattach/8Ms/c9bb66c8e3235530926e603446912a8294bef4d5_re_1736942137765" data-origin-width="1671" data-origin-height="2394" style="width:23.97%; margin-right: 10px;margin-top: 10px;"><img src="https://t1.daumcdn.net/cafeattach/8Ms/c9bb66c8e3235530926e603446912a8294bef4d5_re_1736942137765" class="txc-image-grid"></span><span data-url="https://t1.daumcdn.net/cafeattach/8Ms/76d96fe4a76023af63758219410317595540ec8d_re_1736942137765" data-origin-width="1674" data-origin-height="1379" style="width:41.69%; margin-right: 10px;margin-top: 10px;"><img src="https://t1.daumcdn.net/cafeattach/8Ms/76d96fe4a76023af63758219410317595540ec8d_re_1736942137765" class="txc-image-grid"></span><span data-url="https://t1.daumcdn.net/cafeattach/8Ms/2fc71e3104cfc533b3e0fdd78d961d1490c2f036_re_1736942137765" data-origin-width="2992" data-origin-height="2992" style="width:34.34%; margin-top: 10px;"><img src="https://t1.daumcdn.net/cafeattach/8Ms/2fc71e3104cfc533b3e0fdd78d961d1490c2f036_re_1736942137765" class="txc-image-grid"></span></div><div class="figcaption"></div></div><p style="text-align: left;">안녕하세요<br><br>5번째가 제가 풀이한 방식인데요, 판단 다 잘해놓고 계산방법에서 틀리니 더 아쉽네요 🥲<br><br>어떤 포인트에서 틀린 건지, 저런 식으로 접근하면 안 되는 것인지 궁금합니다!<br><br><br>+) 궁금한 부분은 수정B 금액부분입니다 저는 (1)자료인 6.45부터 (3)자료까지 가산하는 방법으로 접근했는데<br>여기서 뭘 틀린 것인가요?!<br><br><br><br><br><br>감사합니다</p>