{"id":"unit-price-calculator","engine":"core","category":"math","name":"เปรียบเทียบราคาต่อหน่วย","fields":[{"key":"priceA","label":"ราคา A","type":"number","default":8,"required":true},{"key":"quantityA","label":"จำนวน A","type":"number","default":500,"required":true,"min":0.000001},{"key":"priceB","label":"ราคา B","type":"number","default":12,"required":true},{"key":"quantityB","label":"จำนวน B","type":"number","default":800,"required":true,"min":0.000001}],"sample":{"priceA":8,"quantityA":500,"priceB":12,"quantityB":800}}