Bevis is an adviser to WT, a fund management firm. WT's clients are all high-net-worth clients in the U.S. Bevis manages the account for Clare, one of his clients, which had a total return of 4.418% last year. Bevis wants to calculate the return due to the foreign currency contribution.
Exhibit 1 summarizes the investment information for Clare's account last year
Calculate the contribution of foreign currency to the total return.
the Clare account’s total (US dollar) return of 4.418%.
The weighted asset return is equal to 1.8%, calculated as follows:
(60%×5%）+[ 40%×（-3%）] = 1.8%
The domestic-currency return is equal to the sum of the weighted asset return, the weighted currency return, and the weighted cross-product of the asset return and the currency return. The latter two terms explain the effects of foreign-currency movements.
Therefore, the contribution of foreign currency equals 2.618% = 4.418% - 1.8% .
要求解的“the contribution of foreign currency”是包含了两部分的，一是RFX，二是交叉项RFC ×RFX。
因此，在总的return中减掉RFC 后，剩下的return就是由foreign currency贡献的return了。
the contribution of foreign currency = wiRFX +wiRFCRFX