John has taken 10 pictures every day for the past 3 years.  He saves them in raw format so each memory card can store 50 images.  Each memory card costs $60.  How much does he spend on memory cards?
He takes pictures for 3*365=
<gadget id="calculator">3*365</gadget>
<output>1_095</output>
1095 days.
So he takes 10*1095=
<gadget id="calculator">10*1095</gadget>
<output>10_950</output>
10,950 pictures.
That means he needs 10950/50=
<gadget id="calculator">10950/50</gadget>
<output>219</output>
219 memory cards.
So he spends 219*60=$
<gadget id="calculator">219*60</gadget>
<output>13_140</output>
13140 on memory cards.

<result>13_140</result>