question: A shop sells school supplies. One notebook is sold at $1.50 each, a pen at $0.25 each, a calculator at $12 each, and a geometry set at $10. Daniel is an engineering student, and he wants to buy five notebooks, two pens, one calculator, and one geometry set. The shop gives a 10% discount on all the purchased items. How much does Daniel have to spend on all the items he wants to buy?
answer: Five notebooks cost $5 x 1.50 = $<<5*1.50=7.50>>7.50
  Two pens cost 2 x $0.25 = $<<2*0.25=0.50>>0.50.
  The total cost is $7.50 + $0.50 + $12 + $10 =$<<7.5+0.5+12+10=30>>30.
  Thus, total discount is 10/100 x $30 = $<<10/100*30=3>>3.
  Therefore, Daniel has to spend $30 - $3 = $<<30-3=27>>27 on all the items he wants to buy.
  #### 27