10 REM TIME, TIME$ and PAUSE
20 T=TIME
30 FOR I=1 TO 100:X=SQR(I):NEXT I
40 PRINT "A hundred square roots took ";(TIME-T)/50;" s"
50 PRINT "Since the start: ";TIME$
60 FOR N=3 TO 1 STEP -1
70   PRINT N
80   PAUSE 50
90 NEXT N
100 PRINT "Go!"