9. if with else-if

• An if statement with else-if and else clauses:

  
      if ( customerType.equals( "T" ) ) {
          discountPercent = .4;
  
      } else if ( customerType.equals( "C" ) ) {
          discountPercent = .2;
  
      } else if ( subtotal >= 100 ) {
          discountPercent = .2;
  
      } else {
          discountPercent = .1;
      }