A person transports 100 glasses to a store, and the shipping fee is 0.15 yuan for each one delivered, and 0.2 yuan is compensated for the damaged one, and the shipping fee for the damaged glass is not available. The person gets a total shipping fee of 8.7 yuan, and several glasses are damaged on the way cup?
某人为商店运玻璃杯100个，每运到一个可得运费0.15元，损坏一个赔偿0.2元，且不能得到被损坏了的玻璃杯的运费，此人共得运费8.7元，途中损坏几个玻璃杯？
<gadget id="calculator">0.15 * 100</gadget>
<output>15</output>

<gadget id="calculator">15 - 8.7</gadget>
<output>6.3</output>

<gadget id="calculator">0.2 + 0.15</gadget>
<output>0.35</output>

<gadget id="calculator">6.3 / 0.35</gadget>
<output>18</output>

<result>18</result>