Which type of development is Jennifer using if she is writing classes that depend on classes that are already written? A.
bottom-down development
B.
top-down development
C.
aggregation development
D.
bottom-up development

Function tipcalculate (slider, bill){  var tip = document.getelementbyid('tipamount');   var slideval = document.getelementbyid('slideval');   var bill = document.getelementbyid(bill).value;   var prcnt = slider * .01;       if (bill == null || bill == '') {      tip.innerhtml = ' enter an amount';       return false;   }  if(isnan(bill)) {      tip.innerhtml = ' enter a number';       return false;   }  if(bill > = 0){      tip.innerhtml = '$' + (bill * prcnt) .tofixed(2);   slideval.innerhtml = slider + '%';   }}

  answer(smtp)

Ithink it is 1/250 i hope this is

answer
a.the processor b