Out-of-pocket spending was high, costing poor families more than 9% of household income on average.

家庭自费支出很高，平均占贫困家庭总收入的9%以上。

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My next step is to sum up and average the monthly costing figure to track its change over time.

接下来，我把每个月的平均成本加起来，计算出每个月的平均值，从而来追踪一段时间内的变化情况。

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But foreclosure istime-consuming and expensive, taking 18 months on average and costing anestimated 20-25% of the loan balance.

收回房产即耗时又代价昂贵，它平均需要18个月的时间而且估计需要大约为贷款额20-25%的成本。

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The Central African Republic is the most expensive place to get a fixed broadband connection, costing nearly 40 times the average monthly income there.

BBC: UN reveals global disparity in broadband access

Macao in China is the cheapest, costing 0.3% of the average monthly income.

BBC: UN reveals global disparity in broadband access

Assuming a three-year holding period (the average length of investment in mutual funds), this front-end load is costing investors 2.1% per year.

FORBES: This Fund Is For You If You Love Paying Fees