简单的数学题

阿4

请问我有一些货品，乘以0.55等于马币的价钱，然后全部价钱都不统一的提升了0%-23%。如果客人付我马币1万块，任选产品。那我应该怎么计算还没乘0.55转为马币的价钱。需要一个个去算吗？例如A产品，卖价RM100是已经提高了10%，而B产品是RM50，提高20%，还有CDEFG。。。如果客人给了RM10000，然后随意的选，那我应该怎么计算成本价？那我可不可以把几样加10%，几样加15%的等，找一个平均数？应该怎么找呢？

陈星星

let say product A=RM110 (10% increase of RM100), product B=RM60 (20% increase of RM50), product C=....& so forth..
I supposed that the customer pick up (3 x A) + (5 x B) + (8 x C) + .....
adhere the calculation:
since there are differences between product A, B, C, ... & also the percentages charged also reflect to respective product...what i have seen here is to simplify the calculation, you shall make the summation like this ((3 x A (RM100)) x 10%) + ((5 x B (RM50)) x 20%) + ....then u will get the sum subsequently before convert to other currency value....gd luck...