(36+48)+50= 36+(48+50)
(524+308)+50= 524+(308+50)
(12+800)+30= (12+800)+30
(361+152)+148 = 361+(152+148)
(36+48)+50= 36+(48+50)
(524+308)+50= 524+(308+50)
(12+800)+30= (12+800)+30
(361+152)+148 = 361+(152+148)