Leverage ratio的分母不是total asset 吗，为啥解析是explosure

问题如下：

The CRO of Bank LGX, a non-dividend-paying US-based bank is preparing a report to the board of directors on the bank’s capital adequacy and planning. Bank LGX is subject to both the Basel framework and the US banking rules governing global systemically important banks (G-SIBs). The bank claims that it was in compliance with all the capital requirements in January 2016 as all Basel III phase-ins have already occurred. The CRO is conducting the analysis for January 2017 using selected and most recent annual performance data, which are shown in the table below:

The CRO also reports the minimum regulatory capital requirements under the revised capital framework as presented in the table below. The capital ratios also include the capital conservation buffer of 2.5% (phased-in at an annual increment of 0.75%, starting January 2016) and a G-SIB surcharge of 3.0% (phased-in at an annual increment of 0.625%, starting January 2016) of risk-weighted assets to be reached by January 2019:

Given the regulatory benchmark and the bank’s performance, which of the capital requirements does Bank

LGX satisfy as of January 2017?

选项：

A.CET1 capital ratio only

B.

Leverage ratio only

C.

Tier 1 capital ratio and Leverage ratio only

D.

Total capital ratio and CET1 capital ratio only

解释：

The bank’s CET1 capital ratio = (CET 1 capital)/(risk-weighted assets)= (1,515/26,395) = 5.74%.

This ratio meets and exceeds the 5.25% minimum CET1 capital requirement;

The bank’s leverage ratio = (Tier 1 capital)/(Exposure) = (1,515 + 100)/(47,460) = 3.40%. This ratio does not meet the 4.0% minimum leverage ratio requirement;

The bank’s Tier 1 capital ratio = (Tier 1 capital)/(risk-weighted assets)= (1,515 + 100)/26,395) =6.12%. This ratio does not meet the 6.75% minimum Tier 1 capital requirement;

The bank’s Total capital ratio = (Total capital)/(risk-weighted assets)= (1,515 + 100 + 827)/26,395) = 9.25%.

This ratio meets and exceeds the 8.75% minimum Total capital requirement.