diff --git a/mba/ch40.org b/mba/ch40.org
index de34db4..6b039ea 100644
--- a/mba/ch40.org
+++ b/mba/ch40.org
@@ -29,26 +29,44 @@ How do they forcast
 
 ** Ethics
 - be conservative and honest with forecasts
+- some companies try to take from a different quarter to make up shortfalls
 - jailtime
   - it's easy to make clerical mistakes
   - overlook unethical co workers
-- some companies try to take from a different quarter to make up shortfalls
 
-** Cash Conversion Period Ratio
-- *COGS*: Cost of Goods Sold
-  - how much it costs for goods for the day
+** time to turn asses into cash
+*** Cash Conversion Period Ratio
+  - when do we get PAID baby?
+  - *COGS*: Cost of Goods Sold
+    - how much it costs for goods for the day
 
-*** examples
+**** example
 - $5000 of inventory
 - COGS is $50
 - we have 100 days worth of goods
 
 if we put $1 into inventory it won't be converted into cash for another 50 days
 
-** Inventory to sale conversion period
+*** Inventory to sale conversion period
+- measures on a yearlly bases how long it takes to turn inventory to cash over a year
 - you can also do this by season, just replace 365 days with 90 days
-\(\text{ISCP} = \frac{\text{average inventories}}{\text{COGS} \times 365}\)
+  #+NAME: inventory_to_sale_conversion
+  \[
+  \text{ISCP} = \frac{\text{average inventories}}{\text{COGS} \times 365}
+  \]
 
-** Purchase to Payment Conversion Period
+** time to turn credit (not assets) into cash
+- when selling product on credit, how long does it take to turn it into cash
+#+NAME: sales_to_cash_conversion
+\[
+\text{Sales to Cash Conversion Period} = \frac{\text{Average Receivables}}{\text{Sales}} \div 365
+\]
+
+
+** time to pay your bills as late as possible
+- Purchase to Payment Conversion Period
 - pay your bills as late as you can
-\(\text{Purchase to Payment Conversion Period} = \frac{\text{average payables} + \text{average accrued liabilities}}{\text{COGS} \times 365}\)
+#+Name: purchase_to_payment_conversion
+\[
+\text{Purchase to Payment Conversion Period} = \frac{\text{average payables} + \text{average accrued liabilities}}{\text{COGS} \times 365}
+\]