Promotion effectiveness

<div class="water"><div class="caption">PROMOTION PROFIT <b id="net">+$18</b></div><div class="steps"><div><i class="gain"></i><span>EXTRA<br>SALES</span><strong>+90</strong></div><div><i class="leak"></i><span>DISCOUNT<br>LEAK</span><strong id="leak">-42</strong></div><div><i class="cost"></i><span>CAMPAIGN<br>COST</span><strong>-30</strong></div></div><label>DISCOUNT LEAK <input id="leakRange" type="range" min="20" max="80" value="42"></label></div>

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const r=document.querySelector('#leakRange');function draw(){const leak=+r.value,net=60-leak;document.querySelector('#leak').textContent='-'+leak;document.querySelector('#net').textContent=(net<0?'-$'+Math.abs(net):'+$'+net);document.querySelector('.leak').style.height=(leak/90*70)+'%'}r.oninput=draw;draw();setTimeout(()=>{r.value=75;draw()},650);setTimeout(()=>{r.value=42;draw()},2600);