The buyer should order 250 units, since there is a 75 percent probability that demand will be less than this.
( ( The buyer ) ( ( should ( ( ( order ( 250 units ) ) , ) ( since ( there ( is ( ( a ( 75 ( percent probability ) ) ) ( that ( demand ( will ( ( be less ) ( than this ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN buyer)) (VP (MD should) (VP (VB order) (NP (CD 250) (NNS units)) (, ,) (SBAR (IN since) (S (NP (EX there)) (VP (VBZ is) (NP (NP (DT a) (CD 75) (NN percent) (NN probability)) (SBAR (IN that) (S (NP (NN demand)) (VP (MD will) (VP (VB be) (ADJP (JJR less)) (PP (IN than) (NP (DT this))))))))))))) (. .)))
If the demand is lower, we need to buy fewer units.
( ( If ( ( the demand ) ( is lower ) ) ) ( , ( we ( ( need ( to ( buy ( fewer units ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (NN demand)) (VP (VBZ is) (ADJP (JJR lower))))) (, ,) (NP (PRP we)) (VP (VBP need) (S (VP (TO to) (VP (VB buy) (NP (JJR fewer) (NNS units)))))) (. .)))