‹ (iv) Ratings-Based Approach (RBA) CA-6.4.54 › CA-6.4.53 Under the RBA, the risk-weighted assets are determined by multiplying the amount of the exposure by the appropriate risk weights, provided in the tables in paragraph CA-6.4.58 and CA-6.4.59. Apr 08 ‹ (iv) Ratings-Based Approach (RBA) CA-6.4.54 ›