가격 탄력성

<div class="el"><div class="chart"><svg viewBox="0 0 300 140" preserveAspectRatio="none"><path d="M8 20 Q145 36 292 127" fill="none" stroke="var(--accent)" stroke-width="4"/><path d="M8 125 Q145 39 292 109" fill="none" stroke="var(--accent-3)" stroke-width="3" stroke-dasharray="5 4"/><line id="needle" x1="120" x2="120" y1="5" y2="135" stroke="var(--fg)" stroke-width="2"/></svg><span>DEMAND</span><span>REVENUE</span></div><div class="metric"><label>PRICE <b id="p">$40</b></label><input id="pr" type="range" min="20" max="80" value="40"><div>UNITS <b id="u">80</b> · SALES <b id="s">$3,200</b></div></div></div>

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const r=document.querySelector('#pr');function draw(){const p=+r.value,u=Math.round(120-p);document.querySelector('#p').textContent='$'+p;document.querySelector('#u').textContent=u;document.querySelector('#s').textContent='$'+(p*u).toLocaleString();const x=8+(p-20)/60*284;document.querySelector('#needle').setAttribute('x1',x);document.querySelector('#needle').setAttribute('x2',x)}r.oninput=draw;draw();setTimeout(()=>{r.value=65;draw()},650);setTimeout(()=>{r.value=40;draw()},2600);