Investor Presentaiton

Financial Results Sensitivity Major items affecting operating profit by changes in assumptions (3-4Q) Assumption Items Revised assumption Range of fluctuation Segment (from Oct.) Income impact (\ billions) Major Factors Fuel cost, Crude oil price 85.0$/bbl ±10$/bbl Singapore product margin Excluding inventory impact Exchange rate 140.0\/$ +5\/$ +15.0 time-lag +5$/bbl ±22.0 Export Petroleum ±5.0 Fuel cost, time-lag Thermal coal 145.0$/t ±10$/t price Resources (Coal) ±1.0 Thermal coal Crude oil price 85.0$/bbl ±10$/bbl +37.0 Inventory impact Petroleum Exchange rate 140.0\/$ +5\/$ ±11.0 * In the petroleum segment, only performance impacts on products made in domestic refineries are shown. In addition to the above, income will also be affected by sales of overseas affiliates * 3-month impact during shown for the resources segment (coal), as its fiscal year ends in Dec. idemitsu Copyright Idemitsu Kosan Co., Ltd. All Rights Reserved. 41

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