China Noahs exposure is its purchase of wood from Indonesia. The purchases were scheduled to start in 2010 and are estimated to establish 30% of all 17.6 million square meters of wood. The quoted price for 2010 per square meter is IDR 84,090. Looking at return on sales for 2010: a) If the exchange rate were to chain per the forecast, to IDR = 1.0 CNY in 2010, return on sales forecast is 14.9% b) If China Noah were to use currency forwards, the 2010 forward rate is IDR 1,450= 1.0 CNY, return on sales forecast is 14.6% c) If the exchange rate remains unchanged, IDR 1,344 =1.0 CNY, return on sales forecast is 13.5%.

How do you (get) calculate the 14.9% return on sales forecast and the 14.6% forward rate? And what is "exchange rate were to chain per the forecast?"