邮购一种图书,每册书定价为a元,另加书价的10%作为邮费,购书n册,总计金额为y元,则y为( );当a=1.2,n=36时,y值为( )。
an(1+10%);47.52元
The mother ____ tears at the sight of her long lost son, who was sent back by two policemen .
A.burst into
B.burst out
C.burst away
D.burst up