Let's be practical and work out the cost first.

咱们实际一点儿，先计算一下成本费用。

《牛津词典》

Many kaiten sushi places will count how many dishes you have had and work out the cost from the different colors of the dishes.

许多回转寿司店通过数盘子以及区分盘子的不同颜色来结算。

youdao

Banks have to work out the cost of the damage done by years of easycredit and gorging on complicated financial products (see article).

银行不得不计算出多年放宽信贷条件所造成的损害成本，然后贪婪地大吃错综复杂的金融产品大餐。

youdao

Banks have to work out the cost of the damage done by years of easy credit and gorging on complicated financial products (see article).

ECONOMIST: The world economy

One way of doing that is to work out the cost of disposal and charge firms and households for rubbish collection based on the volume they produce.

ECONOMIST: The waste industry

In the air, planes will actually be nearer to the orbiting device, rather than farther away, and assuming a line-of-sight link from the road, the truck can work out kinks at a fraction of the cost.

ENGADGET: Visualized: JetBlue and ViaSat test Fly-Fi in-flight WiFi... from the ground